Possible Clues:

• Let-down
• Diana's engagement is a let-down
• Sadness caused by sacking?
• Frustrating thing, redundancy process?
• Detective's engagement must be a let-down
• CID officer's job leads to frustration
• Police officer's position causes frustration
• Girl's lotion, after application, leads to failure
• With Director on top, is job a let-down?
• Day one's date is a letdown