Might a Tory often upset official delegation? (5,2,8)
I believe the answer is:
power of attorney
'official delegation?' is the definition.
(something officially delegated to another person)
'might a tory often upset' is the wordplay.
'might' becomes 'power' (synonyms).
'upset' is an anagram indicator.
'a'+'tory'+'often'='atoryoften'
'atoryoften' anagrammed gives 'ofattorney'.
'power'+'ofattorney'='POWER OF ATTORNEY'
(Other definitions for power of attorney that I've seen before include "sufficient for deed" , "legal authority" , "American lawyer's energy" , "Agent's authority" .)