I could get it working from command line, but not able to figure out how to do it via desktop file. I copied the desktop file from /usr/share/applications to .local/share/applications and edited Exec line to /home/user/bin/clapper and in ~/bin/clapper I have,
#!/bin/sh
export MESA_GLES_VERSION_OVERRIDE=3.2
clapper "$@"
But when starting clapper by clicking on the icon and entering a URL it crashes - passing url from command line works (I have added this variable in ~/.bashrc also).