Conduct oneself properly (6)

I believe the answer is:

behave

'conduct oneself properly' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for behave that I've seen before include "Handle" , "Conduct oneself properly" , "Act or react - show good manners" , "Act in a certain manner" , "Act correctly" .)

I've seen this clue in The Mirror and The Sun.

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