Sings like the Swiss (6)
I believe the answer is:
yodels
'sings like the swiss' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yodels that I've seen before include "Sings in manner of Swiss mountain dwellers" , "Sings like Swiss mountain dwellers" , "Sings badly" , "Sly ode (anag.)" , "Sings Alpine-style" .)