Information on category (5)
I believe the answer is:
genre
'category' is the definition.
(I know that genre is a type of form)
'information on' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'on' becomes 're' (regarding).
'gen'+'re'='GENRE'
(Other definitions for genre that I've seen before include "Brand" , "Artistic or literary category" , "Style (of art/literature)" , "Style/category of art" , "expressive style of music" .)