Sovereign consumed by temper, originally (7)
I believe the answer is:
emperor
'sovereign' is the definition.
(emperor is a kind of sovereign)
'consumed by temper originally' is the wordplay.
'consumed by' says the answer is hidden in the clue (I've seen this in other clues).
'EMPEROR' can be found hidden inside 'temper originally'.
(Other definitions for emperor that I've seen before include "Beethoven piano concerto, Op. 73" , "Supreme ruler" , "chap such as Charlemagne" , "Title of sovereignty" , "Sovereign and richly-colored butterfly" .)