Related Clues:

• Letting up
• On the decline
• Becoming weaker
• On the way out
• Settling down
• Subsiding
• In decline
• Dying down
• Ebbing
• Decreasing in size
• 'Declining, going down (6)'
• There's no wax for an inclusion in the flier
• The tin, having got into a sack, is getting less
• Easing off
• Like the moon in last quarter