Liverpudlians may well play in it! (3)

I believe the answer is:

red

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for red that I've seen before include "'If you see it, perhaps you're angry (3)'" , "Florid" , "Blushing" , "Stop light" , "Colour of garnets" .)

I've seen this clue in the Evening Standard.

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