Stop sending bread (5)
I believe the answer is:
debar
'stop' is the definition.
(I've seen this before)
'sending bread' is the wordplay.
'sending' indicates an anagram (letters are sent to different positions).
'bread' is an anagram of 'DEBAR'.
(Other definitions for debar that I've seen before include "Prevent from doing something" , "Ban" , "Formally prevent" , "Blackball" , "Exclude - bread (anag)" .)