It’s high in distortion (3)

I believe the answer is:

tor

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

'it's high' is the definition.
I can't judge whether this defines the answer.

'in distortion' is the wordplay.
'in' indicates a hidden word.
'TOR' is hidden within 'distortion'.

Can you help me to learn more?

(Other definitions for tor that I've seen before include "Rot on rocky peak" , "Rocky outcrop" , "A rocky hill in Devon" , "High, rocky, bare hill" , "Dartmoor peak" .)

I've seen this clue in the Evening Standard.

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