Sing, Swiss-style (5)
I believe the answer is:
yodel
'sing swiss-style' 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 intermittent falsetto" , "Sing partly falsetto" , "Loftily call" , "Sing using falsetto" , "Sing (Swiss style)" .)