Refuse to eat quickly (4)
I believe the answer is:
fast
'quickly' is the definition.
(I know that quickly can be written as fast)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for fast that I've seen before include "Express" , "Secure; speedy" , "Relating to the mind" , "Firmly attached; rapid" , "Brisk" .)