Related Clues:

• Building material to bind things
• Solid, real
• Ingredient of concrete
• Not abstract or imaginary
• It's used to make concrete
• Powder substance to make concrete
• As one is being in the part I see, one is just being a sucker?
• It gets harder to get a hundred onto the 14 down
• It's very hard to get a hundred over on the island
• Being hard up, I've got only a cent about me
• Grey from Yeats, not from Gray
• All set for the century on the island
• It's said to follow the pronoun, just to make it hard
• What was so grey for Yeats, thinking of Innisfree
• Hail to the people in there underfoot