Least fresh (7)
I believe the answer is:
stalest
'least fresh' is the definition.
('stale' is the opposite of 'fresh' so 'stalest' should be a synonym for 'least fresh')
This is all the clue.
(Other definitions for stalest that I've seen before include "Least original" , "Most unoriginal" .)
I've seen this clue in The Star Tribune and the LA Times.
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