Related Clues:

• Mouse appendage
• Whippet wagger
• Dick, at times
• Deer's scut, e.g.
• Nero Wolfe, for one
• Head alternative
• Switched appendage
• Pin the ___ on the donkey
• Keep tabs on, perhaps
• Mr. Ed's fly swatter
• Follow, as a suspect
• Stick one's nose in
• What a donkey gets at a children's party
• Shadower in a whodunit
• Secretly follow