Spell ‘carnet’ wrong (6)
I believe the answer is:
trance
'spell' is the definition.
(I know that spell can be written as trance)
'carnet wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'carnet' with letters rearranged gives 'TRANCE'.
(Other definitions for trance that I've seen before include "Daze" , "Deep sleeplike state" , "Reverie" , "Mesmerised state" , "Canter about a daydream" .)