Uncertain state of bishop in car (5)
I believe the answer is:
limbo
'uncertain state' is the definition.
(state of uncertainty)
'bishop in car' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'in' indicates putting letters inside.
'car' becomes 'limo' (limo is a kind of car).
'b' going inside 'limo' is 'LIMBO'.
'of' is the link.
(Other definitions for limbo that I've seen before include "W.Indian dance" , "Waiting state; Caribbean dance" , "waiting time" , "Dance - place of oblivion" , "In medieval theology, heavenly abode for the unbaptised" .)