Crossword Genius

Put in motion part four of drama at Globe finally (8)

Ross

I believe the answer is:

activate

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'put in motion' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for activate that I've seen before include "Give life to" , "Turn on" , "Put in motion" , "Put into operation" , "Stimulate to action" .)

I've seen this clue in The Telegraph.
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