Crossword Genius

One on the flighty side? (4)

Ross

I believe the answer is:

wing

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'side?' is the definition.
(I've seen this in other clues)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for wing that I've seen before include "Take . . . . to fly away (4)" , "Side piece" , "Arm of building or bird" , "Flank; move quickly" , "bit of a mansion" .)

I've seen this clue in the Evening Standard.
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