Crossword Genius

Radical baseball pitcher (6)

Ross

I believe the answer is:

leftie

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'radical' is the definition.
(a left-wing person)

I can't explain the rest of the clue.

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(Other definitions for leftie that I've seen before include "supporter of "gauche"?" , "A radical (colloq.)" , "socialist" , "Person with radical tendencies (informal)" , "Red" .)

I've seen this clue in The Hindu.
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