Tyrolean refrain (5)
I believe the answer is:
yodel
'tyrolean refrain' 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 like Frank Ifield?" , "Sing like some Alpine dwellers" , "Sing in high pitch like Swiss mountain dwellers" , "Sing using falsetto" .)