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Mental ability to understand, say, a multi-dimensional surface (5)

Ross

I believe the answer is:

brain

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'mental ability' is the definition.
'brain' can be an answer for 'ability' (brain is a kind of ability). I'm unsure of the 'mental' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for brain that I've seen before include "Intellectual ability" , "Clever person" , "The grey matter" , "It's in the skull" , "and 15 ac. The loss of experts through emigration" .)

I've seen this clue in The Hindu.
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