Mule is spoilt with dish of rolled oats, nuts, fruit, etc. (6)
I believe the answer is:
muesli
'dish of rolled oats nuts fruit etc' is the definition.
I can't judge whether this defines the answer.
'mule is spoilt' is the wordplay.
'spoilt' indicates anagramming the letters.
'mule'+'is'='muleis'
'muleis' with letters rearranged gives 'MUESLI'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for muesli that I've seen before include "Breakfast mixture of oats, nuts, fruit etc" , "Breakfast food of cereals, fruits, nuts etc" , "Breakfast mixture of dry cereals and fruits" , "Type of breakfast cereal" , "Swiss breakfast?" .)