Discussed shrink, for example (6)
I believe the answer is:
lesson
'example' is the definition.
(I know that example can be written as lesson)
'discussed shrink' is the wordplay.
'discussed' indicates a 'sounds like' (homophone) clue.
'shrink' becomes 'lessen' (I've seen this in another clue).
'lessen' sounds like 'LESSON'.
'for' acts as a link.
(Other definitions for lesson that I've seen before include "See 1" , "Unit of instruction" , "Cautionary tale" , "Severe reproof" , "15 down period" .)