Deficiencies in what some urban architects do? (10)

I believe the answer is:

scarcities

I'm a little stuck... Click here to teach me more about this clue!

'deficiencies' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

(Other definitions for scarcities that I've seen before include "deficits" , "Lacks" .)

I've seen this clue in The Telegraph.

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.