Guinevere's heartiness gets Ada in a state! (6)

I believe the answer is:

nevada

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'state' is the definition.
(I know that Nevada is a state)

'guinevere's heartiness gets ada' is the wordplay.
'guinevere's heartiness' becomes 'nev' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'gets' is a charade indicator (letters next to each other).
'nev'+'ada'='NEVADA'

'in a' is the link.

Can you help me to learn more?

(Other definitions for nevada that I've seen before include "South-west US state" , "The Silver State" , "US desert state" , "Curiously, Dan and Eva are in the US" , "State including Las Vegas" .)

I've seen this clue in the Evening Standard.

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