Possible Clues:

• Rubber-like substance
• Exchanging least with more springy rubber-like plastic
• Doctor eats morel - it's somewhat rubbery
• Eg rubber dinghy catches cat after end of race
• Deal up to me on right stuff resuming shape
• Always securing final order for material
• One may get from ores metal material
• Material obtainable from ores — metal
• Eat morsel that's horrible rubbery stuff
• Rubber always kept almost flexible