Possible Clues:

• Look up about practice available for a winger
• Bird with parasite left to last
• Type of thrush
• Louse (anag.)
• Ring bird by lake, following old custom
• Bird left at bottom of river
• Bird similar to blackbird
• 'The - is larger than a blackbird, and feeds on haws' (Gilbert White)
• Bird betrayed by Toulouse-Lautrec
• Bird of tremendous eloquence