Adult, one man's transformed state (5,4)
I believe the answer is:
tamil nadu
'state' is the definition.
(I have seen 'Indian state ' mean 'tamil nadu' so perhaps 'state' could also mean 'tamil nadu')
'adult one man's transformed' is the wordplay.
'one' becomes 'i' (Roman numeral).
'transformed' is an anagram indicator.
'adult'+'i'+'man'='adultiman'
'adultiman' is an anagram of 'TAMIL NADU'.
(Other definitions for tamil nadu that I've seen before include "Southern state of India" , "state bordering Kerala" , "Southern Indian state" .)