Crossword Genius

Ruler in mood beheaded old Romeo (7)

Ross

I believe the answer is:

emperor

(Other definitions for emperor that I've seen before include "Penguin of largest known species - a great ruler" , "Supreme ruler" , "Large richly-coloured butterfly" , "Tsar" , "Sovereign and richly-colored butterfly" .)

I've seen this clue in The Sun.
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