Related Clues:

• Decay (which can be dry)
• Arborist's anathema
• Go green, perhaps?
• Become unsafe to eat
• Rust on surface -- will nothing stop it?
• Turn putrid
• Decay, like wood
• Go off tripe
• Go green, maybe?
• Get mushy in the fridge, say
• Go bad, like a jack-o'-lantern two days after carving, seemingly
• Penned unlimited rubbish
• Gradually wear away, as an old wooden porch
• Deteriorate to mush
• Republican brought up to corruption