Equatorial high ground? (3)

I believe the answer is:

tor

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

'high ground?' is the definition.

'equatorial' is the wordplay.
'TOR' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for tor that I've seen before include "High, rocky, bare hill" , "Rot on a Cornish hill" , "Fermenting agent" , "Rocky outcrop" , "Dartmoor peak" .)

I've seen this clue in the Evening Standard.

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