Archer is at university, protected by police (5)
I believe the answer is:
cupid
'archer' is the definition.
(I've seen this before)
'at university protected by police' is the wordplay.
'at university' becomes 'up'.
'protected by' means one lot of letters goes inside another.
'police' becomes 'cid'.
'up' inserted inside 'cid' is 'CUPID'.
'is' acts as a link.
(Other definitions for cupid that I've seen before include "Roman Eros" , "Roman god of love, child archer" , "a help to Santa" , "armed youth" , "One killed for religion" .)