How do I prevent Terminal.app from capturing Cmd/Ctrl/L?
The trick, really, is to avoid common key-commands - which is why the article you refer to uses  Ctrl ⌃   Opt ⌥   L , as no OS X command would normally use only  Ctrl ⌃  &amp;  Opt ⌥  - they would always add  Cmd ⌘  too, leaving you free to use  Ctrl ⌃   Opt ⌥  for anything you like.

If you insist on using  Cmd ⌘   Ctrl ⌃   L  then you would have to add, for each application that already uses it, a new custom command so it will no longer trigger in preference to your own.

For example, for Terminal, where  Cmd ⌘   Ctrl ⌃   L  is Clear Screen



you would need to replace that in System Prefs > Keyboard > Shortcuts > App Shortcuts



and add a different, non-conflicting shortcut.