Possible Clues:

• Songbird, typically having a brown back and a spotted breast
• Bird, typically having a brown back, spotted breast, and loud song
• Most of the career for singer
• Bird with a speckled breast
• Small songbird
• Songster cut the grass
• Common garden bird
• Flyer that's spotted extremely tough attack
• Bird shoot follows on Thursday
• Small bird — fungal mouth infection