Peak in the Bernese Alps (5)
I believe the answer is:
eiger
'peak in the bernese alps' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eiger that I've seen before include "Mountains in Bernese Alps" , "North wall mountain" , "Keen" , "Mount" , "Swiss mountain, hard N. face" .)