It's high and to the upper end (3)

I believe the answer is:

tor

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

'to the upper end' is the wordplay.
'end' indicates one should take the final letters.
The final letter of 'upper' is 'r'.
'to'+'r'='TOR'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for tor that I've seen before include "Feature of Dartmoor" , "fell" , "Rot on a Cornish hill" , "Hill or rocky peak" , "Rocky prominence" .)

I've seen this clue in the Evening Standard.

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