Controls dog, say, around college? Go over again (9)
I believe the answer is:
reinspect
'go over again' is the definition.
('inspect' can be a synonym for 'go over' so perhaps 'reinspect' is OK for 'go over again')
'controls dog say around college?' is the wordplay.
'controls' becomes 'reins' (rein is a kind of control**).
'dog say' becomes 'pet' (dog is an example).
'around' means one lot of letters goes inside another.
'college?' becomes 'c'.
'pet' placed around 'c' is 'pect'.
'reins'+'pect'='REINSPECT'
(Other definitions for reinspect that I've seen before include "Further check" , "Do follow-up work for Ofsted" .)