Crossword Genius

St. Louis landmark (4)

Ross

I believe the answer is:

(Other definitions for arch that I've seen before include "Cunning; bridge" , "Consciously or affectedly playful - under a bridge?" , "spanner" , "Teasing; part of foot" , "Inner part of foot" .)

I've seen this clue in The New York Times, the Universal, the USA Today, the LA Times and The Wall Street Journal.
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