Don't tell (4,3)
I believe the answer is:
keep mum
(Other definitions for keep mum that I've seen before include "Stay silent" , "Don't tell a soul" , "Remain silent" , "(don't mention it)" .)
I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.