Crossword Genius

Prefix with thesis (4)

Ross

I believe the answer is:

anti

'prefix with thesis' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for anti that I've seen before include "An opponent - opposed to party policy, etc" , "Against, informally" , "on the other side" , "Naysayer" , "Prefix meaniing against" .)

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