Almost complete abstainer from pork eating English breakfast (6)
I believe the answer is:
muesli
'breakfast' is the definition.
(common breakfast food)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for muesli that I've seen before include "healthy breakfast?" , "eaten at breakfast" , "Breakfast cereal mix" , "Granola-like food" , "Breakfast dish of cereal, dried fruit and nuts in milk" .)