Vacated search to find this silent order? (2,5)

I believe the answer is:

be quiet

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'order?' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?

'vacated search to find this silent' is the wordplay.
'vacated search' becomes 'be' (I am not sure about this - if you are sure you should believe this answer much more).
'to find' is a charade indicator (letters next to each other).
'this silent' becomes 'quiet' (I've seen this before).
'be'+'quiet'='BE QUIET'

Can you help me to learn more?

(Other definitions for be quiet that I've seen before include "Button it!" , "Hush!" .)

I've seen this clue in The Guardian.

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