Struggle to get the right rhyme (5)

I believe the answer is:

fight

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'struggle' is the definition.
(fight is a kind of struggle)

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

(Other definitions for fight that I've seen before include "Struggle; quarrel" , "Come to blows" , "Contend" , "Strive - struggle" , "Attack or engage in combat" .)

I've seen this clue in the Evening Standard.

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