Married college boy? (6)
I believe the answer is:
united
'married' is the definition.
(similar in meaning)
'college boy?' is the wordplay.
'college' becomes 'uni' (short for university).
'boy?' becomes 'ted' (short for Edward or Theodore).
'uni'+'ted'='UNITED'
(Other definitions for united that I've seen before include "... we stand, divided we fall" , "Got together" , "in league" , "In agreement" , "Manchester City's local rivals" .)