Crossword Genius

Free to come together, turning it upside down (5)

Ross

I believe the answer is:

untie

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'free' is the definition.
(I've seen this in another clue)

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

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(Other definitions for untie that I've seen before include "Undo, unfasten" , "Release bindings or shoelaces" , "Undo, unlace" , "Separate" , "Open a knot" .)

I've seen this clue in The Times.
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