Piece of gossip (2,3)
I believe the answer is:
on dit
'piece of gossip' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for on dit that I've seen before include "Rumour, piece of gossip; I don't (anag.)" , "Hearsay" , "They say" , "gossip in French" .)