Crossword Genius

Smart number after change of leader (5)

Ross

I believe the answer is:

nifty

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'smart' is the definition.
(nifty can mean stylish)

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

Can you help me to learn more?

(Other definitions for nifty that I've seen before include "Particularly effective; stylish" , "Smart" , "Slick" , "Clever; stylish" , "Quick - stylish" .)

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