There's no sense in it (4)
I believe the answer is:
coma
'there's no sense in it' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coma that I've seen before include "Deep sleep" , "State of unconsciousness caused by illness" , "Long period of unconsciousness" , "long sleep" , "State of insensibility" .)