Crossword Genius

Let her do so at full speed! (3)

Ross

I believe the answer is:

rip

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'speed' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for rip that I've seen before include "Slash" , "The familiar Mr Van Winkle" , "Tearaway" , "death wish" , "Parting words" .)

I've seen this clue in the Evening Standard.
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