Auditor’s twin in a fight for honour (4)

I believe the answer is:

duel

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'fight for honour' is the definition.
'duel' can be an answer for 'fight' (dueling is a kind of fighting). I am not sure about the 'for honour' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for duel that I've seen before include "Potentially fatal fight between two people" , "Fight over a point of honour" , "battle" , "Fight between two people over an affair of honour" , "Fight between two persons" .)

I've seen this clue in The Hindu.

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