Crossword Genius

Person not making modest progress, but barely moving! (8)

Ross

I believe the answer is:

streaker

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'person' is the definition.
(streaker is a kind of person)

I don't understand how the remainder of the clue works.

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(Other definitions for streaker that I've seen before include "Person running without clothes" , "Someone running naked in a public place" , "Naked runner" , "Exhibitionist spectator" , "One who runs naughtily nude in public" .)

I've seen this clue in the Evening Standard.
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