College kid in chorus (6)
I believe the answer is:
unison
'chorus' is the definition.
(thesaurus)
'college kid' is the wordplay.
'college' becomes 'uni' (short for university).
'kid' becomes 'son' (male child).
'uni'+'son'='UNISON'
'in' is the link.
(Other definitions for unison that I've seen before include "Concord; with same pitch" , "Simultaneous action" , "interval?" , "Concordance" , "A coincidence of musical notes" .)