Crossword Genius

___ Rhubarb, foil for the Katzenjammer Kids of old comics (5)

Ross

I believe the answer is:

rollo

(Other definitions for rollo that I've seen before include "Viking founder of Normandy dukedom" , "First duke of Normandy" , "Boy" .)

I've seen this clue in The New York Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.