Like glass, perhaps, but you can eat it (7)
I believe the answer is:
brittle
'like' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for brittle that I've seen before include "Fragile" , "apt to snap" , "Easy to break" , "Hard but easily broken" , "Type of toffee made with nuts" .)