Gannet half-removed scrapings from rustly packet (6)
I believe the answer is:
crisps
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for crisps that I've seen before include "Common snack" , "Deep-fried slices of potato" , "Popular snack" , "Thin pieces of fried potato" , "Thin slice of potato fried in deep fat" .)