Sign of a sellout

SRO

"Here’s a helpful hint for the clue "Sign of a sellout" with the answer "SRO": "Abbreviation seen when no seats are left." This hint guides the solver toward thinking about event terminology and abbreviations without directly giving away the answer. It’s easier than the original clue but still requires a bit of deduction."

The clue "Sign of a sellout" leads to the answer "SRO" through the following wordplay: "Sellout" refers to an event where all tickets have been sold, meaning it is sold out. "Sign" suggests an abbreviation or symbol representing this state.