Headgear with a twisted spike (5)

I believe the answer is:

kepis

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'headgear with a' is the definition.
I can't judge whether this definition defines the answer.

'twisted spike' is the wordplay.
'twisted' is an anagram indicator.
'spike' anagrammed gives 'KEPIS'.

Can you help me to learn more?

(Another definition for kepis that I've seen is " French military caps".)

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