Introduced by Stormont -- a nanny state (7)

I believe the answer is:

montana

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

'state' is the definition.
(Montana is an example)

'introduced by stormont a nanny' is the wordplay.
'MONTANA' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for montana that I've seen before include "North-western US state" , "Nato man (anag) - US state" , "The "Big Sky State"" , "Send manna to this US state" , "American state, capital Helena" .)

I've seen this clue in The Telegraph.

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