Keep quiet (4,4)

I think it could be either:

Which length description are you looking for?:

3,5

4,4

pipe down

'keep quiet' is the definition.
(to pipe down is to be quiet)

This is all the clue.

(Other definitions for pipe down that I've seen before include "Sh!" , "Say no more!" , "Shut up!" , "Be quiet!" , "make less noise" .)

I've seen this clue in The Guardian.

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