Crossword Genius

An individual who's not particular (7)

Ross

I believe the answer is:

anybody

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This clue could be a double definition.

'an individual' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'not particular' is the second definition.
The definition suggests a singular noun which matches the answer.

'who's' is the link.

Can you help me to learn more?

(Other definitions for anybody that I've seen before include "Whichever person" , "Each of us" , "no-one in particular" , "An unspecified person" .)

I've seen this clue in the Evening Standard.
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