Answer:
To add a marker to a clip in the Timeline, do the following:
Set up a keyboard shortcut for Add Clip Marker in Edit > Keyboard Shortcuts (Windows), or Premiere Pro > Keyboard Shortcuts (Mac OS).
Select the clip.
Place the Playhead where you want to place the marker.
Press the keyboard shortcut you created for Add Clip Marker.
Step-by-step explanation:
hope this helps!