Majestic display fed by complete source of electricity (9)
I believe the answer is:
sovereign
'majestic' is the definition.
(thesaurus)
'display fed by complete source of electricity' is the wordplay.
I cannot really see how this works, but
'complete' could be 'over' (I've seen this in other clues) and 'over' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sovereign that I've seen before include "13 across -- coin" , "more than a prince" , "Old gold coin" , "Head of state" , "Ruler - gold coin" .)