Swiss or cheddar (6)
I believe the answer is:
cheese
'swiss or cheddar' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cheese that I've seen before include "E.g. brie" , "Produce created from milk curds" , "Gloucester or Edam, say" , "Food made from milk curds" , "It's made from the pressed curd of milk" .)