Stop eating quickly (4)
I believe the answer is:
fast
This clue is a double definition.
'stop eating' is the first definition.
(I've seen this before)
'quickly' is the second definition.
(I know that quickly can be written as fast)
(Other definitions for fast that I've seen before include "fare-dodging" , "Maybe bound to spot" , "Can't move" , "Secure; speedy" , "Moving quickly" .)