Natural extrovert, you said, ultimately seen in nude, is playful (9)

I believe the answer is:

unstudied

'natural' is the definition.
(thesaurus)

'extrovert you said ultimately seen in nude is playful' is the wordplay.
'ultimately' says to take the final letters.
'seen in' is an insertion indicator.
'playful' is an anagram indicator.
The last letters of 'extrovert you said' are 'tud'.
'nude'+'is'='nudeis'
'nudeis' anagrammed gives 'unsied'.
'tud' going inside 'unsied' is 'UNSTUDIED'.

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.