Crossword Genius

Brief admission of ignorance, nominally (4)

Ross

I believe the answer is:

anon

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'nominally' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

'brief admission of ignorance' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'ann' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for anon that I've seen before include "Some time soon" , "Without known author" , "Soon, precious stone" , "Soon, in a little while" , "Well-published writer" .)

I've seen this clue in the Evening Standard.
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