Lion perhaps devours couple, causing gossip (8)
I believe the answer is:
chitchat
'gossip' is the definition.
(synonyms)
'lion perhaps devours couple' is the wordplay.
'lion perhaps' becomes 'cat' (lions are big cats).
'devours' means one lot of letters goes inside another (I've seen this in other clues).
'couple' becomes 'hitch' (I've seen this in other clues).
'cat' placed around 'hitch' is 'CHITCHAT'.
'causing' acts as a link.
(Other definitions for chitchat that I've seen before include "Gossip" , "Inconsequential talk" , "rabbit" , "Gossipy talk" , "Idle nattering" .)