Item of jewellery, article for troublemaker (10)
I believe the answer is:
ringleader
'for troublemaker' is the definition.
(ringleader is a kind of troublemaker)
'item of jewellery article' is the wordplay.
'item of jewellery' becomes 'ring' (I've seen this in other clues).
'article' becomes 'leader' (I can't explain this - if you can you should give a lot more credence to this answer).
'ring'+'leader'='RINGLEADER'
Can you help me to learn more?
(Other definitions for ringleader that I've seen before include "Chief troublemaker" , "Chief mischief maker" , "One heading up illicit activity" , "brains" , "Mastermind" .)