Sid , US comedian who played Coach Calhoun in 1978 film musical Grease (6)

I believe the answer is:

caesar

(Other definitions for caesar that I've seen before include "Roman ruler" , "leader who acts like a dictator" , "Julius, stabbed by Brutus" , "A scare for Roman emperor" , "Old Roman emperor like Julius" .)

I've seen this clue in The Mirror.

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