Military style headgear with twisted spike (5)

I believe the answer is:

kepis

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

'twisted spike' is the wordplay.
'twisted' indicates an anagram.
'spike' with letters rearranged gives 'KEPIS'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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