The part of Mabel, as queen (3)

I believe the answer is:

mab

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'queen' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?

'the part of mabel as' is the wordplay.
'the part of' indicates taking the first letters (I've seen 'part' mean this).
'as' becomes 'ab' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letter of 'mabel' is 'm'.
'm'+'ab'='MAB'

Can you help me to learn more?

(Another definition for mab that I've seen is " Queen--, fairy mentioned in Romeo and Juliet".)

I've seen this clue in the Evening Standard.

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