Crossword Genius

Hard to endure (6)

Ross

There are a few possibilities for this:

'hard to endure' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for trying that I've seen before include "Essaying" , "occupation of Oliver Wendell Holmes Jnr" , "Upsetting" , "Testing" , "Making attempts" .)

I've seen this clue in The Telegraph, The Sun, the L.A. Times Daily, the Universal, The Guardian, The Times, the L.A. Times Magazine and the Sydney Morning Herald.
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