Site for a cliff dwelling (4)

I believe the answer is:

mesa

(Other definitions for mesa that I've seen before include "Geographical feature" , "Flat-topped hill with steep sides, common in the southwestern US" , "In the US south-west, a steep-sided flat-topped hill" , "Flat-topped tableland" , "Flat tableland with steep edges" .)

I've seen this clue in The New York Times.

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