Crossword Genius

Person unlikely to keep a secret (8)

Ross

I believe the answer is:

bigmouth

(Other definitions for bigmouth that I've seen before include "In slang, boaster or uncontrolled talker" , "Braggart with large oral cavity" , "Indiscreet or boastful person" , "Boastful type" , "Loud or tactless talker" .)

I've seen this clue in the Universal.
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