Liverpool's left-wingers? (4)

I believe the answer is:

reds

This clue is a double definition.

'liverpool's' is the first definition.
(nickname for Liverpool FC)

'left-wingers?' is the second definition.
(red is a kind of left-winger)

(Other definitions for reds that I've seen before include "First snooker balls to be potted" , "Scarlet and crimson, say" , "Tidies up" , "Scarlet communists" , "Left-wingers" .)

I've seen this clue in The Telegraph.

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