WORKING clock? No, it says you must have a CLOCK. An approved-for-aircraft-use one.
I don't think I've ever been in a C1xx or a PA28 with a clock that works. We tried for a while to get one that did, but the cost was prohibitive. A Breitling, araldited to the panel, would be cheaper.
I wear a watch, and carry a spare one (with my spare glasses).