"Titanic" co-star, familiarly (3)

I believe the answer is:

leo

(Other definitions for leo that I've seen before include "Astrological sign" , "Man" , "Name taken by 13 popes, the last dying in 1903 aged 93" , "one of several popes" , "Lion constellation" .)

I've seen this clue in The New York Times.

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