Crossword Genius

In parenthesis, believe it or not! (3)

Ross

I believe the answer is:

sic

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'in' is the definition.
Both the definition and answer are adverbs. Perhaps you can see a link between them that I don't see?

I don't understand the remainder of the clue.

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(Other definitions for sic that I've seen before include "Like" , "poorly spelt if requiring this" , "Thus among musicians" , "Printing term to denote accuracy though it appears otherwise" , "Quoted exactly as in the original; so" .)

I've seen this clue in the Evening Standard.
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