Take care not to be introspective (4,3)

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.

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

I've seen this clue in The Globe and Mail.

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