Equatorial hill? (3)

I believe the answer is:

tor

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

'hill?' is the definition.
(I know that tor is a type of hill)

'equatorial' is the wordplay.
'TOR' is hidden in amongst the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for tor that I've seen before include "Rocky outcrop" , "Rot on a peak in Devon" , "Rising" , "It rises" , "Pillar of rock" .)

I've seen this clue in the Evening Standard.

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