Poles accept thrust of what's being said (6)
I believe the answer is:
spoken
'what's being said' is the definition.
(thesaurus)
'poles accept thrust' is the wordplay.
'poles' becomes 'sn' (North and South poles).
'accept' indicates putting letters inside.
'thrust' becomes 'poke' (poking is a kind of thrusting).
'sn' going around 'poke' is 'SPOKEN'.
'of' is the link.
(Other definitions for spoken that I've seen before include "Uttered through the medium of speech" , "Said" , "Declared" , "Verbal" , "Verbalised" .)