Crossword Genius

Barbarian suppressing old agreement? Take care (4,3)

Ross

I believe the answer is:

look out

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'take care' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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

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