Crossword Genius

WWII slogan against dangerously careless talk (5,4,4)

Ross

I believe the answer is:

walls have ears

(Other definitions for walls have ears that I've seen before include "You never know who's listening" , "Wartime warning against loose talk" , "Someone may be listening!" , "keep it to yourself!" .)

I've seen this clue in The Guardian.
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