Don't eat quickly! (4)

I believe the answer is:

fast

I believe this clue is a double definition.

'don't eat' is the first definition.
(fasting is not eating)

'quickly' is the second definition.
(synonyms)

(Other definitions for fast that I've seen before include "Tight; quick" , "Quick; firmly fixed" , "Avoid food; rapid" , "Rapid; firm" , "Starve; quick" .)

I've seen this clue in The Telegraph, The Irish Independent and The Mirror.

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