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 LA Times, The New York Times, the Universal and The Wall Street Journal.
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