Crossword Genius

Densely developed (5-2)

Ross

I believe the answer is:

built-up

(Other definitions for built-up that I've seen before include "Like inner cities" , "Having houses etc" , "Increased in height" , "praised" , "Like urban area" .)

I've seen this clue in The Times.
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.