Crossword Genius

Revealer of secrets (12)

Ross

I believe the answer is:

blabbermouth

(Other definitions for blabbermouth that I've seen before include "one has no discretion" , "Gossiper" , "One likely to give away secrets" , "Telltale" , "Indiscreet individual - humbler abbot (anag)" .)

I've seen this clue in The Sunday Times and The Times.
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