Crossword puzzle clue "one may have a sitter"

One may have a sitter

Getting it on the couch may get a sitter sacked if the parents come home early, even though the kid is asleep and has done all their homework

A sitter may be hired for them

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

Sitter for the little one?

A sitter employs one

One who envies the sitter?

A sub may or may not have one planned