Clue: Spongy, running inside, like Pyramus' eyes? (10)
Answer: PORRACEOUS
Explanation: Definition: like Pyramus' eyes?
**POROUS** ("spongy") with **RACE** ("running") *inside* 
*In Act 5, Scene 1 of* A Midsummer Night's Dream, *the grieving Thisbe says of Pyramus*, "his eyes were green as leeks". Porraceous* means *leek-green*.