Smack in the middle of a crowd, in brief?

PDA

Think of what you might see between two people that’s short for "public display of affection."

"Smack in the middle of a crowd" hints at something happening openly among people, while "in brief" signals the answer is an abbreviation. The phrase plays on "public display of affection," or PDA—a term for couples showing physical affection where others can see it. The word "smack" reinforces the idea of a kiss or embrace, tying the clue together neatly.