College no different to association (5)
I believe the answer is:
union
'to association' is the definition.
(I've seen this before)
'college no different' is the wordplay.
'college' becomes 'uni' (short for university).
'different' indicates anagramming the letters.
'no' anagrammed gives 'on'.
'uni'+'on'='UNION'
(Other definitions for union that I've seen before include "State of being joined together" , "Workers' league" , "Climbing plant" , "Fusion" , "Big old pearl" .)