British gangster stole capital from Panama (6)
I believe the answer is:
balboa
'capital from panama' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'british gangster stole' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'gangster' becomes 'al' (Al Capone).
'stole' becomes 'boa' (I've seen this before).
'b'+'al'+'boa'='BALBOA'
Can you help me to learn more?
(Another definition for balboa that I've seen is " Panamanian port named after Spanish explorer".)