Flat-topped hill (4)

I believe the answer is:

mesa

'flat-topped hill' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for mesa that I've seen before include "Flat-topped mountain" , "Flat tableland with steep edges" , "US steep-sided tableland" , "High land" , "In the US south-west, a steep-sided flat-topped hill" .)

I've seen this clue in the Penny Press, the USA Today, The Times, the LA Times, the Newsday and The Washington Post.

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