| Answer | Crossword Clue |
|---|---|
| POSER | Nut to crack |
| POSER | Tough nut to crack |
| ENIGMA | Tough nut to crack |
| PECAN | Hard nut to crack |
| PECAN | Tough nut to crack |
| ACORN | Tough nut to crack |
| POSER | Hard nut to crack. |
| POSER | Tough nut to crack. |
| ENIGMA | Hard nut to crack |
| POSER | Hard nut to crack |
| ACORN | Hard nut to crack? |
| ACORN | Hard nut to crack |
| ACORN | It's a tough nut to crack |
| EASYJOB | Not a hard nut to crack |
