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Made
cloudy
as
former
students
smoked
(8)
Made cloudy as former students smoked (8)
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The definition is at the beginning of the clue.
How the clue works
"Made cloudy" is what we're defining here, meaning darkened or hidden from view. For the wordplay, stick OBS (old boys, shorthand for former students) in front of CURED — that's how meat gets smoked, i.e. cured — and you're there.