It isn't quite the real me! (5)

I believe the answer is:

realm

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'isn't quite the real me' is the wordplay.
'isn't quite' means to remove the last letter (not quite all of the word).
'real'+'me'='realme'
'realme' with its last letter removed is 'REALM'.

Can you help me to learn more?

(Other definitions for realm that I've seen before include "Area of knowledge under discussion" , "Kingdom; field of interest" , "Area of influence" , "Country" , "King's domain" .)

I've seen this clue in the Evening Standard.

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