| Answer | Crossword Clue |
|---|---|
| NUT | It's tough to crack |
| ACORN | It's a tough nut to crack |
| HARD | Tough to crack |
| ENIGMATIC | Tough to crack |
| NUT | Tough .. to crack |
| PECAN | Tough nut to crack |
| NUT | Tough thing to crack |
| ENIGMA | Tough nut to crack |
| POSER | Tough nut to crack |
| POSERS | Tough nuts to crack |
| POSER | Tough nut to crack. |
| ACORN | Tough nut to crack |
| NUT | It may be tough to crack |
| NUT | Item that can be tough to crack |
| CITYHALL | It's tough to fight, proverbially |
| ATOMS | It's tough to split them |
| HABIT | It's tough to break one |
| TRIPLELUTZ | It's tough to land on the ice |
| DEBT | It's tough to be in a lot of it |
