Related Clues:

• 36-Down filler
• Word with ''jet'' or ''stand''
• Fill (in)
• Body art
• Pen's partner
• Sign, as a contract
• Calligrapher's buy
• Tattoos, slangily
• Well filler
• Pen fluid
• Squid's fluid
• What a quill may be dipped in
• Writing fluid
• Squid fluid
• Octopus defense