Allow me to amend my previous statement, having done further research.
Clyde, I have found, is slang for "a normal person", from the point of view of a Beatnik, an un-hip or unstylish person, from the point of view of a 1960's lounge singer on Star Trek: DS9, a clumsy person, according to Urban Dictionary and other sources, and, as short for the slang term of Clydesdale, a handsome man.
So I guess it all depends on who's saying it, eh?