Pals in high places (4)

I believe the answer is:

alps

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

'high places' is the definition.
(I've seen this in another clue)

'pals' is the wordplay.
'pals' can be anagrammed to 'ALPS'.
However, I am unsure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for alps that I've seen before include "High mountains" , "Mountain system, highest peak Mont Blanc" , "Laps around mountains" , "Mont Blanc is therein" , "high areas" .)

I've seen this clue in the Evening Standard.

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