Possible Clues:

• Turns into bad habit with foundation near Greece
• Flop down on one?
• Flop
• Rising Republican cuts wings off essential Big Bird
• Old gaoler with no source of nutritious food
• Dud
• Near Syria, troop leader finds old city secret
• Prison official allowing escape of any number from bird
• Bird which is found in more than one continent
• Country - fowl