Unruly Tibetan, so pig-headed! (9)
I believe the answer is:
obstinate
'pig-headed' is the definition.
(I've seen this before)
'unruly tibetan so' is the wordplay.
'unruly' indicates an anagram.
'tibetan'+'so'='tibetanso'
'tibetanso' with letters rearranged gives 'OBSTINATE'.
(Other definitions for obstinate that I've seen before include "Stubborn, obdurate" , "Firm" , "Stubbornly persistent" , "Stubborn or unyielding" , "Mulish" .)