Possible Clues:

• British composer is into its complications
• Lay down rule anew involving clubs
• Lean back to relax
• in the matter of the line of the century one must be lying
• Lean in a recumbent position
• How about a hundred may be drawn to sound like 32 down
• Lie about Conservative row
• Assume horizontal or leaning position as for rest
• Adopt horizontal or leaning position
• Lean back, relax