Crossword Genius

Church member keeping a prize boxer, perhaps (5)

Ross

I think it could be either:

class

champ

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But I've got no explanation for this one! Could you help me understand?

(Other definitions for champ that I've seen before include "Munch (at the bit?)" , "Mashed potato with scallions" , "Chew noisily" , "Supreme competitor" , "Victor (slang)" .)

I've seen this clue in The Times.
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