Short-tempered Blairite worried about right (9)
I believe the answer is:
irritable
'short-tempered' is the definition.
(thesaurus)
'blairite worried about right' is the wordplay.
'worried' indicates anagramming the letters.
'about' is an insertion indicator.
'right' becomes 'r' (common abbreviation).
'blairite' is an anagram of 'iritable'.
'iritable' going around 'r' is 'IRRITABLE'.
(Other definitions for irritable that I've seen before include "Crotchety" , "not very polite" , "Peevish" , "Touchy" , "chippy" .)