Inferior sleeping (5)
I believe the answer is:
under
This clue could be a double definition.
'inferior' is the first definition.
(I've seen this in another clue)
'sleeping' is the second definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for under that I've seen before include "Sub" , "Covered" , "See 7" , "Being short" , "In the process of" .)