Crossword Genius

Part of the St. Louis skyline (4)

Ross

I believe the answer is:

arch

(Other definitions for arch that I've seen before include "Vault; roguish" , "Chief: crafty" , "Affectedly playful (4)" , "which may fall and inconvenience walkers" , "Curved form" .)

I've seen this clue in the LA 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.