Crossword Genius

Not one can be found therein! (7)

Ross

I believe the answer is:

neither

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

'one can be found therein' is the wordplay.
'therein' anagrams to 'NEITHER'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for neither that I've seen before include "The rein (anag.)" , "double negative?" , "Therein (anag)" , "In three (anag.)" , "Negative word" .)

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