I ordered my usual size 10 narrow. That size has fit me with all other Clarks that I own.  With this shoe, I really would have needed a 10.5 Narrow, which they don't make.
My toes hit the end of the shoe and the shoe was still to wide. I had to send them back. Other than that, the shoe was good-looking and the insole was comfy. Too bad they didn't fit. Unfortunately, it cost me $12 to return them to the seller. Ouch!