Crossword Genius

Not pro (4)

Ross

I believe the answer is:

anti

'not pro' is the definition.
('anti' is the opposite to 'pro')

This is all the clue.

(Other definitions for anti that I've seen before include "Prefix meaning against" , "Hostile" , "on the other side" , "(Person who is) not in favour" , "Who pooh-poohs all" .)

I've seen this clue in the USA Today, the Penny Press, the LA Times and The Guardian.
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