Related Clues:

• Small songbird
• Small bird
• Songbird
• Bird
• 37-Across, e.g.
• I. M. Pei, for one
• Wee warbler
• Blueprint creator
• One with designs
• Designer of buildings
• Type of bird, may be blue
• A little bird tells you to empty it
• A little bird tells me this is the way to get to empty it, by the sound of it
• Does a little bird tell you the way to empty it?
• There's little of it in the air to empty it, perhaps