Ruby and others (4)
I believe the answer is:
reds
'ruby and others' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reds that I've seen before include "First snooker balls to be potted" , "Left-wingers" , "Scarlet communists" , "Tidies up" , "Colours for communists" .)