1971 musical by Jim Jacobs and Warren Casey set in the fictional Rydell High School (6)

I believe the answer is:

grease

(Other definitions for grease that I've seen before include "Rock musical" , "Musical - lubricant" , "Mechanic (informal)" , "Lubricating agent" , "A thick oily substance" .)

I've seen this clue in The Independent.

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