Possible Clues:

• Difficult to chew
• Rip-off getting uniform for nothing -- it's liable to be bent
• Tough, stretchy
• End of four months in the red, becoming flexible
• Like mozzarella in texture
• Plot to dispose of mum, as tough as old boots?
• Polish fruit, cored, is chewy
• Sh! This consistency might get you there in the garden
• Tough, chewy