Tyrolean's tune (5)
I believe the answer is:
yodel
'tyrolean's tune' 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 "Sing in a certain way" , "Sing like Frank Ifield?" , "Falsetto singing" , "Practise Alpine singing" , "Sing like the Lonely Goatherd?" .)