Related Clues:

• Surplus energy shed by hardy ruminants old lady's feeding
• Memo about a book going cheap
• Prompter to admit a balance
• Prod about inside residue
• The rest stay for the race, not by design
• Rest cue bridging centre of black
• Prompt, having snatched a rest
• Nudge about a number of copies unsold
• Cue holding a rest
• Rest cue around centre of black
• Cue bridging a rest
• Somehow drain mere to reveal what's left
• Rest cue having pocketed second of balls
• Prompt to include article that's left
• Book rest?