To do Alt + M A P on Mac in Excel, download and install Accelerator Keys, then press Option, followed by M, A, P.
Command: Remove Precedent Arrows
This is how to do Alt + M A P on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + M A P remove Precedent Arrows clears arrows showing which cells feed into the selected formula. This removes only the precedent tracing arrows.