20 down
Windy
mansion
that
makes
one
go
blind?
(7)
Windy mansion that makes one go blind? (7)
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The definition is at the end of the clue.
How the clue works
Look at that makes one go blind? — that's your definition, with a cheeky nod to the old wives' tale about the supposed consequences of the practice. Windy is your anagram indicator, and if you shuffle the letters of mansion about you'll land on your answer.