Crossword Genius

The old devil! (5)

Ross

I believe the answer is:

harry

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'devil' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for harry that I've seen before include "See 20" , "Wizard Potter" , "Persistently attack (an enemy)" , "Prince William's younger brother" , "Enfield, perhaps" .)

I've seen this clue in the Evening Standard.
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