Hold-up (5)
'hold-up' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for delay that I've seen before include "Hold back" , "Postponement" , "Put off until later" , "Stoppage" , "hold-up of train?" .)
'holdup' is the definition.
(I know that heist is a type of holdup)
This is the entire clue.
(Other definitions for heist that I've seen before include "criminal activity" , "Armed hold-up (sl.)" , "Audacious robbery" , "Mugging" , "Armed robbery" .)