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' (slang term meaning at university).
'son' becomes 's' (genealogical abbreviation for son).
'illegally acquired' becomes 'hot' (I can't justify this - if you can you should give a lot more credence to this answer).
'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" .)