Related Clues:

• Warning from a doghouse
• Ad-lib, musically
• Become tangled
• Preserves, perhaps
• Sound surly
• Show one's teeth
• Sandwich filler, sometimes
• Act surly
• Driving headache
• Sticky situation?
• Commuter's woe
• What 20-, 37- and 53-Across may do
• Sandwich spread
• Play with friends
• Angry dog's response