Also found in: Wikipedia.
A metaphorical stick one uses to "beat" correct information into an ignorant, incompetent, or slow-learning person (i.e., to help them "get a clue"). I hate reading comments on online news articles—there are so many stupid people out there that I just want to get a big clue stick and knock some sense into them with it!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.