Crossword Genius

Soporific Presley performance with no sign of the King! (6)

Ross

I believe the answer is:

sleepy

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'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" .)

I've seen this clue in the Sydney Morning Herald.
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