Has shocking knockout - fighting headgear needed (5)

I believe the answer is:

shako

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'fighting headgear needed' is the definition.
I can't tell whether this definition defines the answer.

'has shocking knockout' is the wordplay.
'shocking' indicates an anagram (letters shocked or shaken).
'knockout' becomes 'ko' (abbreviation).
'has' is an anagram of 'sha'.
'sha'+'ko'='SHAKO'

Can you help me to learn more?

(Other definitions for shako that I've seen before include "Ceremonial hat" , "Tall military cap" , "Plumed military cap" , "hat from soldier" , "Cylindrical military hat with peak and plume? Really has, ok" .)

I've seen this clue in The Irish Independent.

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