Delay a robbery (4-2)
I believe the answer is:
hold-up
I believe this is a double definition.
'delay' is the first definition.
(I know that delay can be written as hold up)
'a robbery' is the second definition.
(I know that robbery can be written as hold-up)
(Other definitions for hold-up that I've seen before include "Support by arms - threaten by arms" , "Suspend" , "Robbery at gunpoint" , "Robbery with violence" , "Stop and rob" .)