Gives final touches — it’s four in another state (9)
I believe the answer is:
titivates
'gives final touches' is the definition.
I can't judge whether this definition defines the answer.
'it's four in another state' is the wordplay.
'four' becomes 'IV' (roman numeral).
'in' means one lot of letters goes inside another.
'another' indicates an anagram.
'it'+'iv'='itiv'
'state' with letters rearranged gives 'tates'.
'itiv' going inside 'tates' is 'TITIVATES'.
Can you help me to learn more?
(Another definition for titivates that I've seen is " preens".)