Crossword Genius

Supporter finding witty remark after Sunak's first to resign (4)

Ross

I believe the answer is:

ally

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'supporter' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ally that I've seen before include "Friend in time of need" , "State formally cooperating with another" , "He fights on your side" , "A friendly and reliable country" , "Cooperating country" .)

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