Crossword Genius

Like an endless rock and roll performance? (9)

Ross

I believe the answer is:

sisyphean

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'like' is the definition.
Both the answer and definition are adjectives.
Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for sisyphean that I've seen before include "Like tragic character's work" , "uphill" , "requiring unending effort" , "Denoting an unfinishable task" , "such an arduous task" .)

I've seen this clue in The Independent.
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