Blabbermouths (9)

I believe the answer is:

telltales

'blabbermouths' is the definition.
('telltale' can be a synonym of 'blabbermouth')

This is all the clue.

(Other definitions for telltales that I've seen before include "Sneaks" , "Revealers of secrets" .)

I've seen this clue in The Mirror.

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