At university, son illegally acquired result (6)
I believe the answer is:
upshot
'result' is the definition.
(synonyms)
'at university son illegally acquired' is the wordplay.
'at university' becomes 'up' (to 'come up' is to arrive for term, e.g. at Oxford).
'son' becomes 's' (genealogical abbreviation for son).
'illegally acquired' becomes 'hot' (I can't explain this - if you can you should believe this answer much more).
'up'+'s'+'hot'='UPSHOT'
Can you help me to learn more?
(Other definitions for upshot that I've seen before include "One killed the albatross" , "Event" , "Outcome, consequence" , "Outcome of vertical discharge?" , "Outcome, final result" .)