Crossword Genius

Rogue content in spiked headwear (4)

Ross

I believe the answer is:

kepi

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'headwear' is the definition.
(type of military cap)

'rogue content in spiked' is the wordplay.
'rogue' becomes 'kep' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'content in' means to look at the middle letters.
'spiked' becomes 'fortified' ('fortify' can be a synonym of 'spike').
The middle of 'fortified' is 'i'.
'kep'+'i'='KEPI'

Can you help me to learn more?

(Other definitions for kepi that I've seen before include "French military cap" , "Flat-topped military cap" , "French military headgear" , "French military hat" , "What French soldier may assume" .)

I've seen this clue in The Telegraph.
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