Post ends off (4)
I believe the answer is:
send
'post' is the definition.
(I know that post can be written as send)
'ends off' is the wordplay.
'off' indicates anagramming the letters.
'ends' with letters rearranged gives 'SEND'.
(Other definitions for send that I've seen before include "Sentence to a prison term" , "Dispatch by post" , "Mail" , "broadcast" , "Consign" .)