College no different to league (5)
I believe the answer is:
union
'league' is the definition.
(I've seen this before)
'college no different' is the wordplay.
'college' becomes 'uni' (short for university).
'different' is an anagram indicator (letters placed in a different order).
'no' with letters rearranged gives 'on'.
'uni'+'on'='UNION'
'to' acts as a link.
(Other definitions for union that I've seen before include "junction" , "America" , "pearl amongst Shakespeareans" , "Workers' association - marriage" , "Amalgamation" .)