Cincinnati baseballers (4)
I believe the answer is:
reds
'cincinnati baseballers' 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 "First snooker balls to be potted" , "Tidies up" , "Colours for communists" , "Scarlet communists" , "Scarlet and crimson, say" .)