Posted unravelling nets (4)
I believe the answer is:
sent
'posted' is the definition.
('send' can be a synonym of 'post')
'unravelling nets' is the wordplay.
'unravelling' indicates an anagram.
'nets' anagrammed gives 'SENT'.
(Other definitions for sent that I've seen before include "Noiseless" , "Transmitted" , "Remitted" , "Shipped" , "Transported" .)