Crossword Genius

Want of sophistication in arena I ‘ve tested (7)

Ross

I believe the answer is:

naivete

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

'want of sophistication' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'in arena i 've tested' is the wordplay.
'in' says the answer is hidden in the clue.
'NAIVETE' is hidden in the letters of 'arena i ve tested'.

Can you help me to learn more?

(Other definitions for naivete that I've seen before include "Greenness" , "Ingenuosity" , "Quality of the simple" , "Being green" , "lack of sophistication" .)

I've seen this clue in The Times.
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