Tomahawk city? (5)

I believe the answer is:

omaha

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

'city?' is the definition.
(Omaha is an example)

'tomahawk' is the wordplay.
'OMAHA' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for omaha that I've seen before include "Largest city in Nebraska" , "American-Indians" , "Cotton fabric used for curtains and upholstery" , "This was old Indian territory" , "US city; D-Day 16" .)

I've seen this clue in the Evening Standard.

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