Pro's opposite (4)

I think it could be either:

Which length description are you looking for?:

3 4*

'pro's opposite' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for anti that I've seen before include "Definitely not pro" , "Opposed to followers of Hitler" , "Naysayer" , "Hostile" , "One who is against (something)" .)

I've seen this clue in The New York Times and The Washington Post.

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