The most common and most likely answer to this crossword clue is the 7 letter word TATTLER
I've seen this crossword clue in The Times
T
A
T
T
L
E
R
More clues leading to the result TATTLER
Buddy explains!

The straight part
We know that "gossip" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gossip = tattler.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TATTLER mean?
TATTLER noun- One who tattles (notifies authorities of illicit behavior) or is inclined to do so; a tattletale.
- Either of two similar bird species in the shorebird genus Heteroscelus (Tringa in some taxonomies).
- A device fitted to a vehicle to measure mileage etc.