Possible Clues:

• Big cats and sixteenths of a pound
• Malay dagger
• At once this gets us the light bits
• Animals in the pound
• Units for measuring mail weights
• Once it gets involved with us they have little 21 across
• There are 12 in a pound
• Light weights or very small amounts
• They need us to pound them together once and for all
• There are 16 in a pound