Pro's opposite (3)

I think it could be either:

Which length description are you looking for?:

con

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

This is the entire clue.

(Other definitions for con that I've seen before include "Swindle after winning trust" , "Informally swindle" , "Swindle in draconian way" , "Direct steering; study" , "Opposed" .)

I've seen this clue in the Universal, The Star Tribune, The Washington Post, the USA Today and The New York Times.

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