Related Clues:
- Like a tough nut to crack
- "Clouds" A ___ Handshake
- Not squishy, as a mattress
- Business unlikely to yield much
- Very challenging
- Tough to learn
- Tight; company
- How the staunch stand
- Player's challenge? I sympathise
- Mattress description
- Tiring party, breaking rocks perhaps
- Not soft, as a mattress
- Opposite of 8-Down
- Not like a soft mattress
- Far from easy