All that is poetry written after college (8)
I believe the answer is:
universe
'all that is' is the definition.
(I've seen this before)
'poetry written after college' is the wordplay.
'poetry' becomes 'verse' (synonyms).
'written after' is a charade indicator (letters next to each other).
'college' becomes 'uni' (short for university).
'verse' put after 'uni' is 'UNIVERSE'.
(Other definitions for universe that I've seen before include "The whole world" , "sphere of activity" , "Everything that exists anywhere" , "The whole of creation" , "The whole of everything" .)