Police command (4,2)

I think it could be either:

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4,2

open up

'police command' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for open up that I've seen before include "reveal emotions?" , "Speak freely or unlock door" , "Begin to take shots" , "Demand for admittance - become frank" , "Speak freely and without restraint" .)

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