Related Clues:

• Tough stuff
• Render inflexible
• Make tough
• NL Central team
• Cards, in brief
• Missouri city, for short
• What tuning forks are made of
• Mixture of carbon and iron
• Strong building material
• Met Al at the slippery end of the street
• At the end of the street the twister is so metallic it sounds as if one might pinch it
• Sounds as if one might pinch what isn't 27 across
• Iron this, if it comes to the pinch by the sound of it, and drive it from the inside
• This sort of iron may make one feel the pinch, perhaps
• Fill with resolve