Crossword Genius

Lap speed that’s fast (4)

Ross

I believe the answer is:

lick

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'lap' is the definition.
('lick' can be a synonym of 'lap')

I cannot understand how the remainder of the clue works.

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(Other definitions for lick that I've seen before include "(At a) fast pace - beat conclusively" , "Defeat (informal) - speed (informal)" , "Beat; vigorous speed" , "Lap - speed" , "Take in with tongue" .)

I've seen this clue in the Evening Standard.
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