Alpine call (5)
I believe the answer is:
yodel
'alpine call' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yodel that I've seen before include "Sing in high trilling tone like Swiss mountaineer" , "Sing falsetto like Swiss mountain people" , "Alpine mountain call" , "Sing in a certain way" , "Sing in high pitch like Swiss mountain dwellers" .)