Hang around with dopehead's mate (5)
I believe the answer is:
dally
'hang around' is the definition.
(thesaurus)
'with dopehead's mate' is the wordplay.
'with' is a charade indicator (letters next to each other).
'dopehead' becomes 'd' (head letter of 'dope').
'mate' becomes 'ally' (I've seen this before).
'd'+'ally' is 'DALLY'.
(Other definitions for dally that I've seen before include "Waste time" , "Dawdle - delay" , "Procrastinate" , "take time" , "Linger" .)