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Balls first Reardon and then Selby hold — these, perhaps (4)

Ross

I believe the answer is:

reds

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(Other definitions for reds that I've seen before include "Tidies up" , "Scarlet and crimson, say" , "Colourful communists" , "Colours for communists" , "Left-wingers" .)

I've seen this clue in The Guardian.
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