Hang back, waste time (6)
I believe the answer is:
dawdle
I believe this is a double definition.
'hang back' is the first definition.
(thesaurus)
'waste time' is the second definition.
(I've seen this in another clue)
(Other definitions for dawdle that I've seen before include "Potter along" , "Idle along" , "Lag behind" , "Loiter" , "Hang back, waste time" .)