Are you a clever clog? Have you ever been clogged?
Strange. I thought a clog meant a dummy or a bit of a smuck. New one for me. I like smarty pants, myself. It cuts down pretentious people. Never forget that episode of Frasier when this everyday guy, when asked by Frasier why he didn't like him, replied, "Well, I think you are a smarty pants." Frasier knew he was right, and so did we the audience.
Its clever clogs (plural). Clogs are shoes worn by working people especially up here in the North. 'Sparking clogs' was the term used by people who made sparks from the metal 'cegs' underneath the clogs to stop them wearing out too quickly. I just about remember people wearing them. If you were considered, 'too clever by half', a 'clever clogs' it was a slight criticism, sort of like you were showing off superior intellect in an environment that certainly did not need it (the cotton mills). Of course that was bollocks, it was only because people stood up and were counted that we no longer have 6 year olds working 16 hour days in appalling conditions. I am very very proud of my clever clog ancestors.