Ornery (8)
I believe the answer is:
stubborn
'ornery' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for stubborn that I've seen before include "Tenaciously unwilling to give in" , "Unwilling to yield or grant a point" , "Obdurate and unyielding (8)" , "Determined" , "Tenaciously unwilling to yield" .)