Definition
A control on a Garmin G1000 (or similar glass cockpit) bezel that cancels the current entry, removes a selected item, or backs out of a menu or page without saving changes. A press-and-hold of the CLR button typically returns the display directly to the default navigation page (the map page).
Plain English
The button you press to undo what you just typed, close a menu you opened by mistake, or jump back to the main map screen.
Context Anchor
Seen when using an MFD or other cockpit display to move through page groups, menus, messages, or selected data fields.
Derivation
CLR is simply a shortened label for 'Clear', kept to three letters so it fits on a small bezel button. 'Clear' here carries its everyday sense of 'remove' or 'wipe away' -- you are clearing the entry off the screen.
Why Pilots Care
It lets the pilot quickly correct or cancel an input without restarting the unit or losing the rest of the display setup.
Intuition Check
Do not read “CLR” here as an ATC clearance. On the display, CLR means “clear this item” or “back out of this screen.”
Example Sentence 1
After mistyping the destination identifier, the pilot pressed CLR to remove the entry and started over.
Example Sentence 2
Tap CLR to remove the temporary route message after you decline the direct-to request.