Possible Clues:

• 10 with real potential never finishing
• Is the bird forever in the 17 down?
• Log base with bird on a line is constant
• Forever, never-ending
• Constant troubles alter one, nonetheless
• This footman held Prufrock's coat
• That bird is forever in the beer
• Has 'e learnt to go on forever?
• Always and forever
• Bird forever in the ale (7)