Ex with large case (7)
I believe the answer is:
example
'case' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for example that I've seen before include "Something to be imitated" , "Illustrative case" , "Thing illustrating a general rule" , "Instance, specimen" , "Specimen, sample" .)