Crossword Genius

Undertake to get into gear? (6)

Ross

I believe the answer is:

engage

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'undertake' is the definition.
(thesaurus)

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

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(Other definitions for engage that I've seen before include "Pay to serve" , "Employ or captivate" , "Secure" , "Employ, hire" , "Employ as a worker" .)

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