Illinois neighbor (4)
'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]" .)