Let’s look at important things here –
Mars - Mars represents our will power, courage, ability to take actions, aggressive nature, anger, our fighting ability, brother, male friends, a boy friend for a girl, a soldier, an athlete and real estate etc.
Pushya - Pushya is nakshatra of nourishing and taking care of people without any selfish interests. It is closely connected with adoption and child care due to mythological story involved. For more information on Pushya Nakshatra, please check this link - https://www.astrosaxena.com/pushnaksh .
Cancer - As Pushya is a part of Cancer, Cancer sign and its representations become important. Cancer is 4th sign of Zodiac Belt, hence it represents the things represented by 4th house like Mother, Mother's Care, Emotions, Taking Care of Others and Nourishment etc. Cancer is consisted of 2 and half Nakshatras namely Punarvasu, Pushyami and Ashlesha. Cancer's lord is Moon, which again represents almost same things which Cancer and 4th house represents.
Moon - As Moon rules Cancer, Moon's position and dignity is important to know about the overall functioning of any planet in Pushya/Cancer.
Saturn - As Pushya is ruled by Saturn, Saturn's position and dignity will also have an important role in functioning and results of any planet in Pushya.
Houses Involved – Also, we can’t afford to forget the houses involved as a planet can be ruling different houses and sitting in different house for every person as per ascendant and planet’s position. To know overall affect, we have to consider the houses involved as those areas of life are being impacted.
Interpretation of Mars in Pushya Nakshatra – Now, Mars's actions, efforts and energy are coming in zone of Pushya Nakshatra which is about nourishing and taking care of people. It is nakshatra most closely related to medical profession or someone who counsels other person and takes care of him through knowledge and teaching. So, we can most commonly see this person as a Doctor or Surgeon but this is where trickiness of Mars in Cancer comes into play always. A Doctor and a Criminal both have weapon in hand but for completely different reasons. A soldier and a terrorist both have rifle in hand but for completely different reasons. As Mars is debilitated in Cancer, it becomes almost impossible to say with Mars position alone that where this energy will go, i.e. for safeguarding others or hurting others. So, this position can make a surgeon but it can also create an obsessive stalker/criminal. Again, lot will depend on Moon's position and Saturn's position as they are ascendant lords and nakshatra lords. It also depends on person's awareness level that how he wants to utilize this energy, in positive pursuits or otherwise.
Role of Moon – Moon's placement is important to guide Mars in right direction, being Cancer's lord.
Role of Saturn - Saturn's placement is important to guide Mars in right direction, being Pushya's lord.
Other Factors – And of course, we need to consider conjunction, aspects, house lordship, house position and dashas etc to know the exact results of Mars in Pushya. So, we always need to take a holistic view of chart rather than just 1 planetary position.
Conclusion – So, this is how I see Mars in Pushya can work in a chart.