College boy offers togetherness (6)
I believe the answer is:
unison
'togetherness' is the definition.
(I've seen this before)
'college boy' is the wordplay.
'college' becomes 'uni' (short for university).
'boy' becomes 'son' (synonyms).
'uni'+'son'='UNISON'
'offers' acts as a link.
(Other definitions for unison that I've seen before include "Voices in complete agreement" , "with regard to the pitch" , "Musical agreement" , "In agreement - like sound of choir" , "Concord, sounding or singing together" .)