Is mule cooked as a breakfast dish? (6)
I believe the answer is:
muesli
'a breakfast dish?' is the definition.
(I've seen this before)
'is mule cooked' is the wordplay.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'is'+'mule'='ismule'
'ismule' with letters rearranged gives 'MUESLI'.
'as' is the link.
(Other definitions for muesli that I've seen before include "Breakfast mixture of dry cereals and fruits" , "Breakfast mix of oats, nuts, fruit etc" , "Breakfast mush" , "Mixture of cereals etc" , "Breakfast food of cereal, fruits and nuts" .)