Possible Clues:

• Stew - not right to add one rodent
• A disease found by one rodent
• Painful condition accepted by fine rodent
• A disease I got from this rodent
• A beastly pain I don't have, but it's a little beastly
• S.Amer. rodent
• Rodent
• Rodent of Central and South America (I, not Y)
• A painful condition depressing one animal
• A complaint over one animal