How do you say clever fox in German?

There isn't a single perfect translation for "clever fox" in German that captures the same idiomatic feel. The best option depends on the nuance you want to convey:

* kluger Fuchs: This is the most literal and common translation. "Klug" means clever or wise, and "Fuchs" is fox. This is a good general-purpose translation.

* listig Fuchs: "Listig" emphasizes cunning or slyness, more than just general cleverness. This would be a good choice if the fox is being deceitful.

So, "kluger Fuchs" is a safe and accurate bet in most situations. If you want to emphasize cunning, use "listig Fuchs".