Crossword Genius

A ruddy Leftist! (3)

Ross

I believe the answer is:

red

This clue is a double definition.

'a ruddy' is the first definition.
(thesaurus)

'leftist' is the second definition.
(red is a kind of leftist)

(Other definitions for red that I've seen before include "Colour for danger" , "Colour of a cardinal's hat" , "- - poker: Kniphofia" , "River, its source in the US, flowing north to empty into L Winnipeg" , "Looking embarrassed" .)

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