Crossword Genius

Not liable to run quickly (4)

Ross

I believe the answer is:

fast

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'quickly' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for fast that I've seen before include "debauched" , "Avoid food; rapid" , "Brisk" , "Period during which fare is reduced" , "Moored - fleet" .)

I've seen this clue in The Telegraph.
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