I comment when leaving stores for headgear (5)

I believe the answer is:

tiara

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'for headgear' is the definition.
(tiara is a kind of headgear)

I can't explain the rest of the clue.

(Other definitions for tiara that I've seen before include "Jewelled headpiece" , "it goes to one's head!" , "Item of jewellery" , "special headgear" , "Decorative headgear" .)

I've seen this clue in The Times.

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