Most 50% protected time faculty get this by having an existing grant like a K award or T32 grant
current clinician researchers having more than 80/20 clinic research are dwindling! most high level programs require you to be busy enough that realistically, 80/20 is really 100/10! (my translation: 110% of your effort in both directions) But: Despite all, we love it. we signed up for it. Good Luck!