Related Clues:

• Stick
• Tack on
• Stick on
• Add on
• Fasten
• Append
• Attach
• Add at the beginning or end
• Attach securely
• Attach firmly
• Attach (to)
• Attach, as postage
• Glue on, maybe
• Attach a really loud 1-across?
• Add-on to the start or end of a word stem (as in 17-, 25-, 35-, 49- and 57-Across)