Refuse to eat quickly (4)

I believe the answer is:

fast

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'quickly' is the definition.
(I know that quickly can be written as fast)

I can't explain the rest of the clue.

(Other definitions for fast that I've seen before include "Express" , "Secure; speedy" , "Relating to the mind" , "Firmly attached; rapid" , "Brisk" .)

I've seen this clue in The Globe and Mail and The Irish News.

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