"How clever am I?"
Translation:Bin ich nicht clever?
I don't doubt that "clever" is better. But is "klug" wrong? You really need context to do a good job at translating. The annoying thing is that if you do the mouse over on "clever", the list it displays shows "klug" near the top and I (being clever :-) found it more interesting to translate "clever" to "klug" rather than "clever" to "clever". (It just doesn't sound German to me.)