I created a script /home/user/fix7 with contents:
windowid=$(xdotool getwindowfocus)
sleep 0.5
xdotool windowactivate --sync $windowid type 'clear'
xdotool windowactivate --sync $windowid key Return
made it exec chmod +x /home/user/fix7
I went to Control Center, created a custom shortcut
name: clear my screen
command: /home/user/fix7
Then assigned alt+C to that shortcut.
Started a terminal, df, then pressed alt+C .... terminal cleared.
Can someone test this?