Bird: feathers flying in supermarket? (7)
I believe the answer is:
sparrow
'bird' is the definition.
(sparrow is a kind of bird)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for sparrow that I've seen before include "A small chirpy city bird 97)" , "Common town bird" , "Finch-like bird" , "fowl, using outdated term" , "bird produced" .)