Swiss breakfast mix (6)
I believe the answer is:
muesli
'swiss breakfast mix' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for muesli that I've seen before include "Swiss cereal" , "Mixture of crushed grain, nuts etc" , "Swiss breakfast?" , "Dish of dried fruit and cereals" , "Breakfast dish of cereal, nuts and fruit (6)" .)