'Oh, he's not too clever at the moment.'
If you're from my part of England that won't mean Dick is suffering from a sudden attack of stupidity: it'll mean he's not very well.
Pleasingly, this means that Dick can be a cleverdick at the same time as being a not-too-clever Dick, a cleverdick being someone who has a much too high opinion of his own intelligence.
And how about something that's more than clever? Something, in fact, that's clever-clever? Well, that's even more idiotic than a cleverdick, because something that's clever-clever is something where the cleverness is more important than the actual content.
A step even further up (or down) the scale of idiocy from the clever-clever is the person who's always shows off his cleverness, a clever clogs. Obviously he (or she) is a complete idiot because no one, but no one, likes a smart aleck.
That being the case, I shall finish by declaring that I haven't the faintest idea who aleck was, and thus slip modestly away.*
Thing To Do Today: be clever. This word arrived in English in the 1200s as cliver, which meant quick to seize, or adroit. But where the word came from before that is something else I don't know.
*I've just looked it up. The phrase "smart aleck" is possibly derived from Aleck Hoag, a 19th century New York con man and thief.
But it's all right: I'm sure I'll soon forget it.