OK, working on this.
Interestingly when I tried to visit the site it was blank, but I could log in to admin, where the theme I'd previously installed turned out not to be installed. So something about the clone was apparently incomplete.
Regardless, I'm getting a ton of Elementor errors now so I should be able to isolate this. I'll report back.
Quick report: looks like the clone failed to import themes and plugins correctly, so I guess I need to try the clone a third time:
The plugin betterdocs-pro/betterdocs-pro.php has been deactivated due to an error: Plugin file does not exist.
The plugin betterdocs/betterdocs.php has been deactivated due to an error: Plugin file does not exist.
The plugin essential-addons-elementor/essential_adons_elementor.php has been deactivated due to an error: Plugin file does not exist.
The plugin image-optimization/image-optimization.php has been deactivated due to an error: Plugin file does not exist.
The plugin redis-cache/redis-cache.php has been deactivated due to an error: Plugin file does not exist.
The plugin wp-rocket/wp-rocket.php has been deactivated due to an error: Plugin file does not exist.