Info about classification (5)
I believe the answer is:
genre
'classification' is the definition.
(I've seen this in another clue)
'info about' is the wordplay.
'info' becomes 'gen' (informal term for information).
'about' becomes 're' (regarding).
'gen'+'re'='GENRE'
(Other definitions for genre that I've seen before include "Literary or artistic type or style" , "Literary type, species" , "Style of work" , "Artistic or literary category" , "Type or style, of art" .)