Unveil reforms inspired by case of Japanese youth (8)
I believe the answer is:
juvenile
'youth' is the definition.
(thesaurus)
'unveil reforms inspired by case of japanese' is the wordplay.
'reforms' is an anagram indicator.
'inspired by' indicates putting letters inside.
'case of' means to remove the middle letters (outsides of).
'japanese' with its middle removed is 'je'.
'unveil' is an anagram of 'uvenil'.
'uvenil' placed within 'je' is 'JUVENILE'.
(Other definitions for juvenile that I've seen before include "Young or childish, sometimes delinquent" , "Adolescent" , "Youth" , "Young person, not fully developed" , "Young offender" .)