Classes from Information Age (6)
I believe the answer is:
genera
'classes' is the definition.
(I've seen this before)
'information age' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'age' becomes 'era' (I've seen this before).
'gen'+'era'='GENERA'
'from' is the link.
(Other definitions for genera that I've seen before include "Biological groupings" , "Types" , "Blood vessel" , "Biological groups" , "Forms" .)