Trendy information promises to be original (9)
I believe the answer is:
ingenious
'be original' is the definition.
(thesaurus)
'trendy information promises' is the wordplay.
'trendy' becomes 'in' ('in' can mean fashionable).
'information' becomes 'gen' (gen can informally mean information).
'promises' becomes 'IOUs' (promises to pay a debt).
'in'+'gen'+'ious'='INGENIOUS'
'to' is the link.
(Other definitions for ingenious that I've seen before include "Showing inventiveness" , "Brilliant" , "Resourceful" , "Displaying art" , "Artless" .)