Crossword Genius

Put off best Grange once opened (8)

Ross

I believe the answer is:

estrange

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for estrange that I've seen before include "may break up" , "Drive away" , "Anger set (anag.)" , "Alien" , "Reagents (anag.)" .)

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