A piece of flying equipment, naturally (7)
I believe the answer is:
feather
'a piece' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for feather that I've seen before include "Part of a bird's plumage" , "A white one denotes cowardice" , "In your cap, it's an accomplishment" , "trifling thing" , "Wing component" .)