Be careful (4,3)

I think it could be either:

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4,3

4,4

look out

'be careful' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for look out that I've seen before include "A view of the future" , "as Wenceslas did" , "Be on your guard!" , "Take care" , "Beware!" .)

I've seen this clue in The Mirror and the Evening Standard.

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