Posted nets off (4)
I believe the answer is:
sent
'posted' is the definition.
('send' can be a synonym of 'post')
'nets off' is the wordplay.
'off' indicates an anagram.
'nets' anagrammed gives 'SENT'.
(Other definitions for sent that I've seen before include "Told to go - enthralled" , "Transported" , "old money in Tallinn" , "Noiseless" , "Posted" .)