Nobody in particular (7)

I believe the answer is:

someone

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'nobody in particular' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is all the clue.

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(Other definitions for someone that I've seen before include "An unknown person" , "Important person" , "big cheese" , "Celebrity" , "Unspecified person" .)

I've seen this clue in The Irish Independent, the Sydney Morning Herald and The Irish News.

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