Crossword Genius

Comrades rolling around at the snooker hall? (4)

Ross

I believe the answer is:

reds

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'snooker hall?' is the definition.
Although both the answer and 'hall?' are nouns, they are not in the same form of the noun. However, I know that 'snooker' relates to this answer.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for reds that I've seen before include "These are not right" , "First snooker balls to be potted" , "Colourful communists" , "Left-wingers" , "Scarlet communists" .)

I've seen this clue in the Evening Standard.
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