Related Clues:
- Like a cube or sphere
- Idol's melody is reliable, in a rocky way
- Reliable; not hollow
- Hard soil broken by daughter
- Thus cover is substantial
- Rather thick, putting an R in 'investigate'
- Water : liquid :: ice : ___
- Read about brewer's last stout?
- Strongly made or built
- Think about head of rival firm
- 3D shape
- Strong king in his counting-house?
- Solid work at University perhaps involves Republican
- Solid, like an oak
- Stout, last of beer, locked in room