Possible Clues:

• Paint additive
• Pub in possession of the king is solvent
• 'Perhaps more to spare at last, but not on the outside (7)'
• More sparse
• Bar in to the right is less crowded
• Finer pub in the middle of Redruth
• More to spare inside the bottom
• Dissoving agent
• More to spare, perhaps, inside the bottom of it
• More to spare, perhaps, but not out at the end