Crossword Genius

With a fast speed, beat (4)

Ross

I believe the answer is:

lick

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'beat' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for lick that I've seen before include "Lap; beat soundly" , "Taste" , "Lap; defeat" , "Personally clean" , "Lap -- beat hollow" .)

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