Crossword puzzle clue "a restaurant may have one"

A restaurant may have one

"You may have the universe if I may have ___" (Verdi opera line)

Restaurant, or a restaurant patron

Restaurant worker who's rarely in the restaurant

A sub may or may not have one planned

Actor who said "Some people have youth, some have beauty—I have menace"

Sounds you might make when I say "Would you rather watch your parents have sex or have your parents watch you have sex?"

One may have only one big part