Tomahawk part in midwestern city (5)

I believe the answer is:

omaha

I'm a little stuck... Click here to teach me more about this clue!

'midwestern city' is the definition.
'omaha' can be an answer for 'city' (Omaha is an example). I'm not sure about the 'midwestern' bit.

'tomahawk part in' is the wordplay.
'in' says the answer is hidden in the clue.
'OMAHA' is hidden in the letters of 'tomahawk part'.

Can you help me to learn more?

(Other definitions for omaha that I've seen before include "US 1944 D-Day landing beach" , "O, a ham found in US city on Missouri river" , "Cotton fabric used for curtains and upholstery" , "State [CITY!!!]" , "This was old Indian territory" .)

I've seen this clue in The Sun.

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