Green state adding to subpoena I’ve tendered (7)

I believe the answer is:

naivete

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

'green state' is the definition.
(I've seen this in another clue)

'adding to subpoena i've tendered' is the wordplay.
'NAIVETE' is hidden within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for naivete that I've seen before include "Being green" , "Quality of innocent gullibility" , "Innocence or guillibility" , "natural simplicity" , "lack of experience" .)

I've seen this clue in the Sydney Morning Herald.

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