Top headgear (5)

I believe the answer is:

crown

I believe this is a double definition.

'top' is the first definition.
(crown can mean the top of something)

'headgear' is the second definition.
(crown is a kind of headgear)

(Other definitions for crown that I've seen before include "Royal headdress" , "Old coin; whack on head" , "Monarch's headgear" , "Top of the head; coin" , "piece of tooth" .)

I've seen this clue in the Evening Standard.

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