Crossword Genius

Supporter brings complaint about new player (10)

Ross

I believe the answer is:

benefactor

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But I can't explain it at all! Could you help me understand?

(Other definitions for benefactor that I've seen before include "Person giving to a good cause" , "One financially supporting a worthy cause" , "charity supporter?" , "One giving to worthy cause" , "Donor to a good cause" .)

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