| Clue | Source | Date |
|---|---|---|
| Hard-to-please grumblers | Universal | 01 Aug 2017 |
| Hard-to-please grumblers | ||
| Bellyachers | LA Times Daily | 17 Nov 2016 |
| Ones with beefs | USA Today | 20 Aug 2016 |
| Ones with beefs | ||
| Hard-to-please sorts | ||
| Complaint department visitors | ||
| They squawk | ||
| They squawk | ||
| Hard-to-please sorts | ||
| Beef producers | ||
| Complaint department visitors | ||
| Ones with beefs | ||
| Ones with beefs | ||
| Kvetches | ||
| Beef sources | ||
| Grumbling sorts | ||
| Rap producers? | ||
| Bitter complainers. |