Possible Clues:

• Rodent yielding the fur nutria
• Beaver-like South American rodent
• Reluctant to be in good mood over such a ratty, hairy coat
• Large semiaquatic rodent
• Creature in fur coat, feigning modesty, quietly accepted
• Furry animal, shy, with a lead twisted round
• Rodent is timid and the reverse of revolting
• Animal — source of nutria fur
• Large South American aquatic rodent
• Rodent's revolting, climbing under arch