Related Clues:

• Oil source
• Soft-rayed food fish
• Massachusetts' Cape ___
• See 6-Across
• Like some pymts.
• One way to ship
• Stamp on a package
• See 21-Across
• New England catch
• Seafood selection
• Letters on a package
• One way to buy
• Ocean catch
• North Atlantic fish
• Fashionable Cape