Check out organ at college (3,2)
I believe the answer is:
eye up
'check out' is the definition.
(I've seen this before)
'organ at college' is the wordplay.
'organ' becomes 'eye' (eye is a kind of organ**).
'at college' becomes 'up'.
'eye'+'up'='EYE UP'
(Other definitions for eye up that I've seen before include "Appraise" , "Eagerly watch" , "Check out" , "Consider sexual attractiveness of (someone)" , "Look at (someone) appraisingly" .)