The title saved me. I'd gotten "Harpo", :"a past", and "oases", was thinking "hora" (oops), and just couldn't figure anything else out. I left it and when I I saw the title and then "Harpo" - and it clicked: not Karl. The rest took just a few seconds. Fun!
That was fun! I of course had Karl stuck in my mind, too. I got OASES and PREOP and I was thinking what HARPO might have to do with Karl...then someone turned the light on.