Get wind of utter gossip (7)
I believe the answer is:
hearsay
'gossip' is the definition.
(I know that hearsay is a type of gossip)
'get wind of utter' is the wordplay.
'get wind of' becomes 'hear' (synonyms).
'utter' becomes 'say' (to utter something is to speak or say it).
'hear'+'say'='HEARSAY'
(Other definitions for hearsay that I've seen before include "Gossip or idle talk - it's not evidence" , "Gossip or rumour - not allowed as evidence" , "speculation" , "product of grapevine" , "rumoured" .)