Mountain with friend pushing Penny to the bottom (3)

I believe the answer is:

alp

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'mountain' is the definition.
(the Alps are a mountain range)

I can't explain the remainder of the clue.

(Other definitions for alp that I've seen before include "high point" , "Swiss mountain" , "High mountain" , "Mountain pasture" , "One of a European mountain range" .)

I've seen this clue in The Guardian.

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