Nebraska Indian
I believe the answer is:
'nebraska indian' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for omaha that I've seen before include "US city; D-Day 16" , "O, a ham found in US city on Missouri river" , "Cotton fabric used for curtains and upholstery" , "Nebraska's largest city" , "American town" .)