As one college boy (6)
I believe the answer is:
united
'as one' is the definition.
(I've seen this before)
'college boy' is the wordplay.
'college' becomes 'uni' (I've seen this in other clues).
'boy' becomes 'ted' (I've seen this before**).
'uni'+'ted'='UNITED'
(Other definitions for united that I've seen before include "Of one mind" , "... we stand, divided we fall" , "Various football teams" , "Untied, being allied" , "Joined together -- in duet (anag)" .)