Related Clues:

• Violin virtuoso Isaac
• Poop's place
• Radio's bad boy
• Sailor's rear
• Back of a skipjack
• Rear of a ship
• Very severe
• Humorless
• From stem to ___
• Stern about the rules
• Rear, to an admiral
• Wacky Howard
• Like a martinet
• Isaac with a bow
• Unstable 'rents'?