Intractable (9)

I think it could be either:

obstinate

difficult

'intractable' is the definition.
(associated in meaning)

This is the entire clue.

(Other definitions for obstinate that I've seen before include "Firm" , "Like mules" , "Stubbornly persistent" , "Inflexible" , "Cussed" .)

I've seen this clue in The Sunday Times and The Times.

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