Like an endless rock and roll performance? (9)
I believe the answer is:
sisyphean
'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.
Can you help me to learn more?
(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" .)