Breakfast mix (6)
I believe the answer is:
muesli
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breakfast mix</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for muesli that I've seen before include "Breakfast mush" , "Swiss breakfast?" , "Breakfast food of cereal, nuts, dried fruit etc with milk" , "Breakfast food of cereals, dried fruit, nuts etc" , "Mixture of crushed grain, nuts etc" .)