Scoundrel's stolen goods including ring and yen (9)
I believe the answer is:
scallywag
'scoundrel's' is the definition.
(scallywag is a kind of scoundrel)
'stolen goods including ring and yen' is the wordplay.
'stolen goods' becomes 'swag' (I've seen this before).
'including' means one lot of letters goes inside another.
'ring' becomes 'call' ('call' can be a synonym of 'ring').
'and' is a charade indicator (letters next to each other).
'yen' becomes 'y'.
'call'+'y'='cally'
'swag' placed around 'cally' is 'SCALLYWAG'.
(Other definitions for scallywag that I've seen before include "A slangy rascal" , "Delinquent" , "reprobate" , "Scamp" , "Good-for-nothing - undersized animal" .)