Crossword Genius

Fight for which a ring is needed (10)

Ross

I believe the answer is:

engagement

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'fight' is the definition.
(I know that fight can be written as engagement)

I don't understand the remainder of the clue.

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(Other definitions for engagement that I've seen before include "Betrothal; appointment" , "calls for signs of commitment" , "Commitment to marriage" , "Date, battle, or betrothal" , "Action necessary for breach" .)

I've seen this clue in the Evening Standard.
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