Possible Clues:

• Just a little, beastly love
• Lemming kin
• River bank rodent
• Meadow mouse, by another name
• Small, burrowing rodent
• Hamster relative
• Five cheer in Mexico for little rodent
• Burrowing, mouselike rodent
• New love of Mouse's relative
• Novelist releases Nits from The Mouse-Like Rodent?