Explaining Cliches

The lede in this article about the Fed’s rate drop caught my eye.

They say the best cure for a hangover is a little hair of the dog that bit you, meaning a nip of whatever you were drinking the night before.

Isn’t the whole point of a cliche that you don’t need to define it? (Incidentally, the writer did keep up the hangover thread beyond the intro; bravo for that.)