Crossword Genius

Those sealed in secrecy? (4)

Ross

I believe the answer is:

lips

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for lips that I've seen before include "Top edges of vessels" , "Take, O take those - away (Measure for Measure)" , "Brims, rims" , "Rim of the mouth" , "Fleshy folds on the face" .)

I've seen this clue in the Evening Standard.
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