Possible Clues:

• Middling
• A practical joke produced by early riser for a song
• Flier's prank
• Mischief that's often in the ascendant
• Pacer
• Bird that sings in flight
• Bird left where all birds were gathered
• Flighty type — and what one may get up to?
• 'Alouette' subject
• Brown Old World songbird