Swindle American, pocketing gold ring (6)
I believe the answer is:
corona
'ring' is the definition.
(I've seen this before)
'swindle american pocketing gold' is the wordplay.
'swindle' becomes 'con' (con is a kind of swindle).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'pocketing' indicates putting letters inside (pocket can mean to steal or take possession of).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'con'+'a'='cona'
'cona' going around 'or' is 'CORONA'.
(Other definitions for corona that I've seen before include "Trumpet" , "Racoon (anag.)" , "Long cigar" , "shining circle" , "Circle of light around the sun during an eclipse" .)