One at Agincourt causing feathers to fly? (7)
I believe the answer is:
longbow
'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" .)