Possible Clues:

• Period of little note
• Is it the second bits of it that make it so small? (6)
• Just a very short time
• It takes very little to get in in a silent one
• Very small like unit of time
• Twinkling a little
• Insignificant
• Little — 60 18 across
• Tiny like time unit (6)
• Far from developed pond dweller I own, by the sound of it?