Post stuff to the auditors (4)
I believe the answer is:
jamb
'post' is the definition.
(I've seen this before)
'stuff to the auditors' is the wordplay.
'stuff' becomes 'jam' (synonyms).
'to the auditors' indicates a 'sounds like' (homophone) clue (auditor can mean a person who listens).
'jam' is a homophone of 'JAMB'.
(Other definitions for jamb that I've seen before include "Side post of a doorway" , "Door, window side post" , "part of doorway?" , "Door-frame side" , "Vertical side of a doorway" .)