Joined Edward after college (6)
I believe the answer is:
united
'joined' is the definition.
(I know that joined can be written as united)
'edward after college' is the wordplay.
'edward' becomes 'ted'.
'after' says to put letters next to each other.
'college' becomes 'uni' (short for university).
'ted' after 'uni' is 'UNITED'.
(Other definitions for united that I've seen before include "Manchester City's local rivals" , "Allied, standing together" , "Allied or combined" , "Made one" , "Got together" .)