Mary ___ Retton (former Olympic gymnast) (3)

I believe the answer is:

lou

(Other definitions for lou that I've seen before include "--- Costello, US comic" , "Male or female" , "-- Reed, rock musician" , "-- Costello, Abbott's partner" , "-- Reed, singer" .)

I've seen this clue in the Universal.

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.