Cycling no different for steep hill (4)

I believe the answer is:

mesa

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'hill' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for mesa that I've seen before include "Flat-topped mountain" , "Geographical feature" , "Flat-topped hill with steep sides, common in the southwestern US" , "Isolated flat-topped hill" , "High land" .)

I've seen this clue in The Independent.

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