Art category (5)
I believe the answer is:
genre
'art category' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for genre that I've seen before include "Artistic or literary category" , "Style/category of art" , "Green (anag)" , "Particular style of art or literature, may be green" , "Literary type, species" .)