Possible Clues:

• Gall, say, marketing with short weight included
• It's well within what the choristers do to come to prominence
• Make a song about the water hole that's getting bigger
• Sign of an injury
• Make notes about spring inflation
• One has no contract to make a song about a well
• Trading about a quarter, but it's on the increase
• ....vocalise without very much increasing in volume
• Tumour
• Lump - provide information about source