Sandwich cheese (5)
I believe the answer is:
swiss
'sandwich cheese' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for swiss that I've seen before include "Eg, native to Geneva" , "Relating to Switzerland" , "One from Basle" , "Nationality of C. G. Jung" , "From a country in west central Europe" .)