Possible Clues:

• Gnarled sire out with leading crooks?
• Rein in twins, those running the enterprise
• Crime bosses, or what the first words of the starred answers can be
• Material in bullets carried by those resembling gangland bosses?
• Troublesome aces will give van in doubles
• Criminal bosses may excite nerdier gals
• Articles call initially for mischief-makers to be found
• Most prominent people in operas and art-songs we hear beginning to sing
• Wagnerian-opera principals who foment sedition