Fail to pay attention that's small inconvenience (7)
I believe the answer is:
slumber
'inconvenience' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe you can see an association between them that I don't see?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for slumber that I've seen before include "nap" , "Overnight social event for (American) teenage girls" , "Snooze" , "Doze" , "The rest" .)