Actor Kieran of "Succession"

CULKIN

This actor is part of a famous Hollywood family and played a memorable role in a 1990 holiday classic before joining the Roy family drama.

This clue refers to Kieran Culkin, the actor who plays Roman Roy in the HBO series Succession. The answer is his last name, "CULKIN," which fits the crossword’s letter count. It’s a straightforward reference—no wordplay or tricks—just testing knowledge of the show’s cast. If you’ve watched Succession, his sharp, sarcastic performance makes him hard to forget.