Information about an art style (5)
I believe the answer is:
'an art style' is the definition.
(I've seen this in another clue)
'information about' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'about' becomes 're' (regarding).
(Other definitions for genre that I've seen before include "Kind" , "Type or style, of art" , "expressive style of music" , "Style/category of art" , "Category of literature" .)