Related Clues:

• OPEC concern
• Cruet filler
• Drilling target
• Breakfast fare
• Mexican entree
• Kind of shell
• Loosen, in a way
• Painter's medium
• Sandwich that crunches
• See 71-Across
• Crankcase contents
• Heat source
• Word with shell or Bell
• Burrito alternative
• South-of-the-border order