Crossword Genius

"It's quite high, on a building," we put in (3)

Ross

I believe the answer is:

tor

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

'in' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'it's quite high on a building we' is the wordplay.
I cannot really understand how this works, but
'on' could be 'to' and 'to' is found within the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'put' acts as a link.

Can you help me to learn more?

(Other definitions for tor that I've seen before include "Rot on a Cornish hill" , "Hill or rocky peak" , "Rot on rocky peak" , "Rocky crag" , "Rot on a peak in Devon" .)

I've seen this clue in the Evening Standard.
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