Crossword Genius

Most difficult (7)

Ross

I believe the answer is:

hardest

'most difficult' is the definition.
('hard' can be a synonym of 'difficult')

This is the entire clue.

(Other definitions for hardest that I've seen before include "Trashed (anag) - most oppressive" , "Most difficult or firm" , "Red hats (anag.)" , "most difficult to unravel" .)

I've seen this clue in The Times, the King Feature Syndicate, the Thinks.com, the Penny Press, The Sun, The Telegraph and the New York Times.
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