Of people to keep up with, there's one (or more) here (5)
I believe the answer is:
jones
'of people to keep up with there's one or more here' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for jones that I've seen before include "Tom, Bobby or Aled" , "See 19" , "Common Welsh surname" , "See 1 Across" , "See 8" .)