Crossword Genius

Free BBC after first of August (5)

Ross

I believe the answer is:

untie

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'free' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for untie that I've seen before include "get rid of bonds" , "Release, loosen" , "Release from bonds or open shoelace" , "Unite (anag)" , "Detach" .)

I've seen this clue in The Times.
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