Crossword Genius

Harry to keep on complaining (3)

Ross

I believe the answer is:

nag

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'harry' is the definition.
(both can mean to consistently bother)

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

Can you help me to learn more?

(Other definitions for nag that I've seen before include "Henpeck, scold non-stop" , "Mount" , "Annoy the old horse persistently" , "plague" , "Grumble; horse" .)

I've seen this clue in The Telegraph.
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