Possible Clues:

• Fellow artist initially idly drew ducks and crow
• Cross-breed has change of heart to make ordinary chicken cry
• Crow over tucking into spread cool dad cooked
• Call at farm drawing a sketch and a half under pile of hay
• Early morning farmyard cry
• Cocoa looked odd -- that could be a wake-up call
• Crow of a male domestic fowl
• Crow parrot played for time
• Raise a casual sort of thirteen, perhaps, with old wake-up call
• Early morning call from Dorking or Orpington?