Crossword Genius

Roman aqueduct structure (4)

Ross

I believe the answer is:

arch

(Other definitions for arch that I've seen before include "Teasing; part of foot" , "Vault; roguish" , "Masonry construction for spanning an opening" , "Curved part of stone bridge, perhaps" , "Consciously or affectedly playful - under a bridge?" .)

I've seen this clue in the USA Today.
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