Alpine singing (5)
I believe the answer is:
yodel
'alpine singing' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yodel that I've seen before include "Swiss warble" , "Sing (Alpine folk music)" , "Sing like the Lonely Goatherd?" , "Sing like some Tyroleans" , "Falsetto singing" .)