A bit of caution at terms for talk (6)
I believe the answer is:
natter
'talk' is the definition.
(I have seen 'Casual talk' mean 'natter' so perhaps 'talk' could also mean 'natter')
'a bit of caution at terms' is the wordplay.
'a bit of' indicates the answer is hidden within the clue (I've seen 'a bit' mean this (the answer is formed by a bit of the clue)).
'NATTER' is hidden within 'caution at terms'.
'for' is the link.
(Other definitions for natter that I've seen before include "idle talk" , "Idle chat" , "Gossip, maybe annoyingly" , "Chat busily" , "Chat - gossip" .)