Possible to change which clip becomes active under playhead?

Thanks for the input! But isn't this the same as just left-clicking the mouse when the mouse arrow is already hovering the clip? Typically I preview the project by hitting "space bar", and when I see something wrong in the preview window, I stop playing by hitting space bar again. Now the uppermost clip is activated. By this time I typically want the clip in the primary storyline to be activated.

Q1: Is there a way to change which clip becomes activated when pausing the project / changing the position of the playhead?

Q2: I am probably missing something, but why is "hovering the mouse --> clicking "c"" easier/quicker than just left-clicking the mouse?

Ah, I just realized! I dont have to put the pointer anywhere, I can just pause the preview --> click "c", and the videoclip in the primary storyline is selected =) This also happens when there is a video clip in the secondary storyline (e.g. b-roll), the clip in the primary storyline is selected when hitting C wherever the playhead is located.