Traitor gets graduate capital (5)
I believe the answer is:
rabat
'capital' is the definition.
(capital of Morocco)
'traitor gets graduate' is the wordplay.
'traitor' becomes 'rat' (rat can mean a treacherous person).
'gets' indicates putting letters inside (gets can mean captures or absorbs).
'graduate' becomes 'BA' (someone with a Bachelor of Arts degree).
'rat' placed around 'ba' is 'RABAT'.
(Other definitions for rabat that I've seen before include "Moroccan capital" , "Moroccan city" , "N African city" , "Capital of Morocco" , "N African capital" .)