Crossword Genius

Political party's summits (4)

Ross

I believe the answer is:

alps

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'political party's summits' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for alps that I've seen before include "South-central European mountain system" , "high areas" , "European mountain chain" , "& 11 their highest peak" , "Eur. mountain range" .)

I've seen this clue in the Sydney Morning Herald.
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