Got to take a few things into perspective though.
It was Murray's first game on clay for over three years. Wawrinka had two preparation tournaments on clay going into this unlike Murray.
This is only his sixth match back on the tour circuit after a very long time out and having a new hip fitted.
Murray's game has always bee built around his first serve (it was way off today) and hitting with power which will only come back with time and more match play.
His game strength too was always court speed and fitness but he's been unable to get that block of training in due to the pandemic so his game loses something then.
And lets not forget that Stan Wawrinka is the better clay court player. They have now played on the surface six times and Wawrinka leads 5-1.
When you have been out of the sport for so long, a sport that is a physical one at that you are never going to return and slip right into tournament winning form. It takes time to shake off rust, get your touch and feel back and improve your match fitness.