Crossword Genius

How is marionette kept under control? (2,1,6)

Ross

I believe the answer is:

on a string

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'under control?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for on a string that I've seen before include "under one's control" , "Yo-yo is" , "left dangling?" , "under complete control" , "Pearl may be" .)

I've seen this clue in the Sydney Morning Herald.
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