Largest city in Nebraska (5)
I believe the answer is:
omaha
'largest city in nebraska' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for omaha that I've seen before include "This was old Indian territory" , "American Indian" , "American-Indians" , "Cotton fabric used for curtains and upholstery" , "Nebraska's largest city" .)