Related Clues:

• Bill's companion, calm for the most part
• Murmur of a dove
• Gosh! Bird's lost its tail
• (Of pigeon) murmur
• Softly murmur
• Start to croon nothings?
• Bill's companion? Goodness me!
• Goodness? Chef's squeezed out the last bit
• Call of a dove
• Softly speak one reason for global warming?
• Sound made by dove getting crumbs
• Sound sophisticated, almost
• Bill's companion shows surprised expression
• Sound coming from dovecote, well I never!
• Speak fondly as constant pair?