Uncertain state (5)
I believe the answer is:
limbo
'uncertain state' is the definition.
(state of uncertainty)
This is the entire clue.
(Other definitions for limbo that I've seen before include "Once the supposed abode of unbaptised souls of babies" , "It's close to hell!" , "Uncertain period awaiting a resolution" , "Prison" , "Caribbean dance - place for lost souls" .)