Daniel upset over Eva in a precious state? (6)

I believe the answer is:

nevada

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'precious state?' is the definition.
'nevada' can be an answer for 'state?' (I've seen this before). I'm not certain of the 'precious' bit.

'daniel upset over eva in a' is the wordplay.
'daniel upset' becomes 'dn' (I can't justify this - if you can you should give a lot more credence to this answer).
'over' says the letters should be written backwards.
'in' indicates putting letters inside.
'dn' written backwards gives 'nd'.
'nd' enclosing 'eva' is 'nevad'.
'nevad'+'a'='NEVADA'

Can you help me to learn more?

(Other definitions for nevada that I've seen before include "Western US state" , "US state, capital Carson City" , "Southwestern US state" , "US desert state" , "Curiously, Dan and Eva are in the US" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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