Greene almost wrecked literary style (5)
I believe the answer is:
genre
'literary style' is the definition.
(I've seen this before)
'greene almost wrecked' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'wrecked' indicates anagramming the letters.
'greene' with its final letter taken away is 'green'.
'green' is an anagram of 'GENRE'.
(Other definitions for genre that I've seen before include "Style of work" , "Artistic or literary category" , "Brand" , "class" , "Kind" .)