Related Clues:

• Tattooist's supply
• Squid weapon
• Body art, slangily
• Do a certain cartoonist's job
• Drawing medium
• Pad content
• Newspaper need
• Marine defense, perhaps
• Penman's paint?
• Lithography need
• Printer's buy
• Writing material
• It may be invisible
• Sign, per Variety
• Pen partner