Great American Ball Park team (4)

I believe the answer is:

reds

'great american ball park team' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in The Wall Street Journal.

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