Unyielding, obstinate (11)

I believe the answer is:

intractable

This clue is a double definition.

'unyielding' is the first definition.
(thesaurus)

'obstinate' is the second definition.
(associated in meaning)

(Other definitions for intractable that I've seen before include "Hard to deal with" , "Unmanageable" .)

I've seen this clue in The Telegraph.

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