Crossword Genius

Where it's an advantage to have friends in the mountains? (4,6)

Ross

I believe the answer is:

high places

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

'friends in the mountains?' is the definition.
The definition suggests a plural noun which matches the answer.

'where it's an advantage' is the wordplay.
I cannot quite understand how this works, but
'it's' could be 'es' ('e' can mean 'electronic' which is similar to 'IT') and 'es' is located in the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'to have' is the link.

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