Crossword Genius

Rough characters appear when Atletico and Arsenal meet (6)

Ross

I believe the answer is:

coarse

'rough' is the definition.
(associated in meaning)

I cannot understand how the rest of the clue works.

(Other definitions for coarse that I've seen before include "Boorish" , "Rough in texture or crude in manner" , "Rude, base" , "Rough, uncouth" , "needing refinement" .)

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