Related Clues:
- One's sometimes pulled in to beach child's play -- I must be old
- Hard case; projectile
- Hard protective case
- £2 printed on book cover
- You come out of it when you rock out
- Sea shell
- Popular seashell
- Crustacean's protection
- Conch's covering
- Trumpet for Triton
- Thimblerig object (and a link to 17- and 59-Across and 11- and 29-Down)
- Explosive projectile
- Drop bombs on second place of torment
- Outside of an egg
- M&M's exterior