Political party's summits (4)
I believe the answer is:
alps
'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" .)