Proust novel in state of unconsciousness (6)
I believe the answer is:
stupor
'state of unconsciousness' is the definition.
(I've seen this before)
'proust novel' is the wordplay.
'novel' is an anagram indicator.
'proust' is an anagram of 'STUPOR'.
'in' is the link.
(Other definitions for stupor that I've seen before include "Coma - lassitude" , "Coma, lethargy" , "Almost unconscious condition caused by drink or drugs" , "State of near insensibility" , "Daze, semi-consciousness" .)