lol, for anything that's DC instead of AC?
There are lots of DC things, including the internal circuitry of things that start out with AC from the wall but then rectify that to DC. In the automotive world there is anything and everything on the vehicle.
If you would never use it for DC then there is the answer to whether you need that feature. There are a few circuits on a vehicle that have higher amps than a typical budget grade multimeter ammeter (~10A) can handle but for most vehicle circuits you can use a meter series connection instead of a clamp ammeter, or measure the voltage drop between two points to find a current flow problem, but if you have the opportunity to exchange your AC only meter for a dual function at a small cost or hassle increase, then I'd go ahead and do it.
Remember to avoid a common mistake that some make using a clamp ammeter to measure AC wall current on corded *appliances*. You can only have the hot or neutral wire in the clamp, not both (not the whole power cord) or they'll cancel each other out. Because of this, for many AC mains powered devices (up to 15A) I would sooner plug them in to a Kill-A-Watt meter to get a current reading, much faster and easier unless you set up a test jig for multiple uses, that has an outlet and plug at opposite ends and pulls aside a length of wire between them so you aren't disassembling the appliance to separate the wires.