Crossword Genius

Nor could it be therein? (7)

Ross

I believe the answer is:

neither

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

'nor could it' is the definition.
I can't tell whether this defines the answer.

'therein?' is the wordplay.
'therein' anagrams to 'NEITHER'.
But, I am unsure how this is indicated.

'be' acts as a link.

Can you help me to learn more?

(Other definitions for neither that I've seen before include "Not one of two" , "None of the two" , "Negative word" , "And not; nor yet" , "Therein lies not one or the other" .)

I've seen this clue in the Evening Standard.
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