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

I believe the answer is:

caesar

(Other definitions for caesar that I've seen before include "Eg, Augustus, Julius" , "Title of the Roman emperors" , "Taking little bites" , "A scare for Roman emperor" , "US comedian" .)

I've seen this clue in The Mirror.

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