Crossword Genius

_ora B_? Completing it would be smart (5)

Ross

I believe the answer is:

natty

'be smart' is the definition.
(I've seen this before)

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

(Other definitions for natty that I've seen before include "Stylishly dressed" , "Smartly dressed" , "Stylish" , "Smart, spruce" , "Dapper (colloq.)" .)

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