Possible Clues:

• Perhaps at or on this if you wait for it, by the sound of it
• On or at? Wait for it, by the sound of it
• At or on to scale and wait a lot for this
• At or on more weight than you'll ever put on
• At or on this, perhaps, or wait a lot for it by the sound of it (4, 2, 2)
• 'At or on this, it's heavy (4,1,3)'
• At or on no light matter