Oklahoma has enveloped this city on the Missouri (5)
I believe the answer is:
omaha
'city on the missouri' is the definition.
(I've seen this in another clue)
'oklahoma has enveloped' is the wordplay.
'OMAHA' is hidden within the letters.
However, I am not sure how the hidden word is indicated.
'this' is the link.
Can you help me to learn more?
(Other definitions for omaha that I've seen before include "place in Nebraska" , "US city; D-Day 16" , "American-Indians" , "O, a ham found in US city on Missouri river" , "This was old Indian territory" .)