Least dirty (8)
I believe the answer is:
cleanest
'least dirty' is the definition.
('clean' is the opposite of 'dirty' so 'cleanest' should be a synonym for 'least dirty')
This is the entire clue.
(Other definitions for cleanest that I've seen before include "Most dirt-free" , "Most hygienic" .)
I've seen this clue in The Star Tribune and The Times.
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