Possible Clues:

• Guerrilla group once given smuggled goods
• Guerrilla group involved in smuggling
• Old Nicaraguan guerrilla group’s smuggled goods
• Don't ban car fluid that's illegally imported
• Smuggled pictures returned after trick associated with group
• Illegal traffic of criminal gang pinching paintings back
• Illegally imported goods
• First three characters from 15 across found on Irish beach with ring from the black market
• Group of Nicaraguan rebel fighters? It's run illegally
• Not pro musicians in unwanted traffic