Mixed up senses in state of uncertainty (8)
I believe the answer is:
suspense
'state of uncertainty' is the definition.
(I've seen this before)
'mixed up senses' is the wordplay.
'mixed' indicates an anagram.
'up'+'senses'='upsenses'
'upsenses' anagrammed gives 'SUSPENSE'.
'in' acts as a link.
(Other definitions for suspense that I've seen before include "Nervous uncertainty; cessation" , "Nervous anticipation" , "State of uncertainty about the future" , "State of anxiety while waiting" , "State of uncertainty or excitement" .)