Possible Clues:

• The sound of a complement will increase like this
• Increase to a double century and regret it
• Build up interest in a working group, say
• Grow, as capital
• It's re, perhaps, this for your support
• Be added to, develop
• Increase by periodic additions
• Those groups will never get one over the eight
• Grow or accumulate, say interest
• Shipping company heard to make a profit