Enter a clue or pattern or both:
The Clue
Riotous group's activity (7 letter answer)
The Answer
MOBBING
Tags
Notes
The answer MOBBING is so rare that it appears less than once every 2500 puzzles.
Definition
MOB as a verb:
1. (throng, mob, pack, pile, jam) = press tightly together or cram; "The crowd packed the auditorium"