Illinois' neighbor (7)
'illinois neighbor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for iowa that I've seen before include "Midwest US state" , "State of USA" , "Central US state" , "'Hawkeye State'" , "American state, capital Des Moines" .)
(Other definitions for indiana that I've seen before include "___ Jones, Harrison Ford hero - US state" , "State in which one may find Gary" , "___ Jones (Raiders of the Lost Ark)" , "Gary's place" , "member of 2 [THE STATES]" .)