Crossword Genius

To a lesser degree, you're wrong (3,2)

Ross

I believe the answer is:

not so

I'm a little stuck... Click here to teach me more about this clue!

'wrong' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for not so that I've seen before include "Wrong" , "untrue" , "Less" .)

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