Crossword Genius

Not eating quickly (4)

Ross

I believe the answer is:

fast

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'quickly' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for fast that I've seen before include "Renounce food; quick" , "sort of convenience food" , "Brisk" , "Quick - stop eating" , "fare-dodging" .)

I've seen this clue in The Everyman puzzle in The Observer and The Times.
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