What's evident in same repeated geographical feature? (4)

I believe the answer is:

mesa

I'm a little stuck... Click here to teach me more about this clue!

'geographical feature?' is the definition.
(I've seen this before)

'what's evident in same repeated' is the wordplay.
'same' can be anagrammed to 'MESA'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

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

I've seen this clue in The Independent.

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