Crossword Genius

One at Agincourt causing feathers to fly? (7)

Ross

I believe the answer is:

longbow

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'fly?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for longbow that I've seen before include "Ancient weapon" , "taken up by The Archers" , "Medieval weapon" , "Decisive weapon at Agincourt" , "Mediaeval weapon" .)

I've seen this clue in The Sun.
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