New treat, spreading gossip (6)
I believe the answer is:
natter
'gossip' is the definition.
(I know that gossip can be written as natter)
'new treat spreading' is the wordplay.
'new' becomes 'n' (abbreviation as in New Testament NT).
'spreading' indicates an anagram.
'treat' with letters rearranged gives 'atter'.
'n'+'atter'='NATTER'
(Other definitions for natter that I've seen before include "Chat casually" , "Chat away informally" , "idle talk" , "Talk socially without exchanging too much information" , "Chinwag" .)