Warrior’s way to scrub sacred vow? (7)

I believe the answer is:

bushido

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'warrior's way' is the definition.
The definition suggests a singular noun which matches the answer.

'scrub sacred vow?' is the wordplay.
'scrub' becomes 'bush' (synonyms).
'sacred vow?' becomes 'ido' (I do, marriage vow. I am not sure about the 'sacred' bit.).
'bush'+'ido'='BUSHIDO'

'to' is the link.

Can you help me to learn more?

(Other definitions for bushido that I've seen before include "Fighters' code" , "code of honour" , "Code for old military" , "Feudal code of the Samurai" , "Japanese code of chivalry" .)

I've seen this clue in the Sydney Morning Herald.

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