Centre of activity (5)

I think it could be either:

midst

locus

(Other definitions for midst that I've seen before include "Where one is surrounded by other things" , "Central part" , "Thick (of things)" , "Centre" , "Among, amid" .)

I've seen this clue in The Times and The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.