Someone to keep up with? (5)

I believe the answer is:

jones

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'someone' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

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(Other definitions for jones that I've seen before include "See 8" , "Inigo -, sixteen to seventeenth century architect" , "Tom, Bobby or Aled" , "See 1 Across" , "Common Welsh surname" .)

I've seen this clue in the Evening Standard.

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