Soporific Presley performance with no sign of the King! (6)
I believe the answer is:
sleepy
'soporific' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for sleepy that I've seen before include "(Of place) without much activity" , "Quiet" , "Lethargic" , "(Of place) low in activity" , "needing a rest" .)