Crossword Genius

Refuse to eat quickly (4)

Ross

I believe the answer is:

fast

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'quickly' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

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(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 Irish Times, The Irish News and The Globe and Mail.
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