Possible Clues:

• 'His praise may come adieu by and by, by the sound of it (8)'
• Big fan
• One praising novel art aloud
• Flatterer is one among grown-up men
• Flatterer
• No critic of age will take in American soldiers
• Grown-up is without artifice, initially, or is a sycophant
• Person who praises excessively
• Lover said 'Farewell - another time'
• One who praises mature soldiers protecting army leader