Possible Clues:

• Songbird
• Initiation of this Italian test upset singer
• Wee warbler
• Tim's dizzy, encircled by baby bird
• Chickadee, e.g
• 'To empty it, by the sound of it, as a little bird might (6)'
• Little bird with cobalt blue wings
• Bird, male goose, losing weight
• Square to get rid of it for songbird
• Bird -- over time cat will get it