Crossword Genius

Mum (6)

Ross

I believe the answer is:

silent

'mum' is the definition.
(to keep mum can informally mean to stay silent)

This is all the clue.

(Other definitions for silent that I've seen before include "Strange and astonishing thing" , "Listen (anag.)" , "Unheard" , "Noiseless" , "Taciturn" .)

I've seen this clue in The Guardian, the King Feature Syndicate and the LA Times.
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