Escort in the theater, informally

USH

Think of the person who shows you to your seat before the curtain rises.

"Escort in the theater, informally" hints at someone who guides people to their seats—commonly called an usher. The clue uses "informally" to signal that the answer is the short, casual version of the word, dropping the "-er" ending. It’s a straightforward definition with no hidden wordplay, just a nod to the everyday term for this role.