Possible Clues:

• Seems like a painful complaint I get from a rodent
• With a painful complaint, I come from the New World in a beastly way
• Rodent, not indoors, a soldier's seen around
• The rodent is first-rate about a painful inside
• Caribbean rodent
• It's enough to make an American soldier ratty not be in in here (6)
• There's beastly little of a painful complaint I get
• A complaint by one relative of guinea pig
• Rodent that makes an affectionate pet
• Rodent, one supporting a painful condition