Crossword Genius

Not knowing that I grant no admission to (8)

Ross

I believe the answer is:

ignorant

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

'not knowing' is the definition.
Both the definition and answer are adjectives.
Maybe they are linked in a way I don't understand?

'i grant no admission to' is the wordplay.
'i grant no' can be anagrammed to 'IGNORANT'.
But, I'm not sure how the anagram is indicated.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for ignorant that I've seen before include "No rating (anag) - clueless" , "Poorly-educated" , "Without knowledge" , "Lacking in education" , "Lacking knowledge or awareness" .)

I've seen this clue in the Evening Standard.
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