Coach covered old warrior's code (7)

I believe the answer is:

bushido

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'warrior's code' is the definition.
'bushido' can be an answer for 'code' (I have seen 'honourable code' mean 'bushido' so perhaps 'code' could also mean 'bushido'). I'm not sure about the 'warrior's' bit.

'coach covered old' is the wordplay.
'coach' becomes 'bus' (synonyms).
'covered' becomes 'hid' (I've seen this in another clue).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'bus'+'hid'+'o'='BUSHIDO'

Can you help me to learn more?

(Other definitions for bushido that I've seen before include "Code for old military" , "chivalric code" , "Code of the Japense Samurai" , "code out east" , "Fighters' code" .)

I've seen this clue in The Telegraph.

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