Event in Illinois accounted for uprising (8)
I believe the answer is:
occasion
'event' is the definition.
(occasion is a kind of event)
'in illinois accounted for uprising' is the wordplay.
'in' indicates the answer is hidden within the clue.
'uprising' is a reversal indicator.
'noisacco' can be found hidden inside 'illinois accounted for'.
'noisacco' back-to-front is 'OCCASION'.
(Other definitions for occasion that I've seen before include "A special event, or the time it happens" , "Time when an event takes place" , "incident" , "Special event or celebration" , "Cocoa's in (anag.)" .)