Mark showing conformity with European safety standards is genuine on this packaged food (6)
I believe the answer is:
cereal
'food' is the definition.
(I know that cereal is a food)
'mark showing conformity with european safety standards is genuine on this packaged' is the wordplay.
I cannot really understand how this works, but
'european' could be 'e' (abbreviation e.g. EU) and 'e' is present in the answer.
'genuine' could be 'real' (similar in meaning) and 'real' is found in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cereal that I've seen before include "Breakfast food made from grain" , "Eg, 5 Ac" , "Grass producing an edible grain" , "Food prepared from grain" , "Rye, for example" .)