From The Enigma
NPL Magazine
May, 2019
LEXMAN

The answers to this flat are an eight-letter word and, using the same letters in the same order, three shorter words. 

The mayor of New York said, "We've
   reached our full _ _ _ _ _ _ _ _.
We must put a stop now to all
   immigration!"
"But sir, how can we _ _ _    _   _ _ _ _
   population?"

Answer:

CAPACITY
CAP A CITY