Announce new reduction (9)
I believe the answer is:
introduce
'announce' is the definition.
(thesaurus)
'new reduction' is the wordplay.
'new' indicates anagramming the letters.
'reduction' with letters rearranged gives 'INTRODUCE'.
(Other definitions for introduce that I've seen before include "Bring to notice or make known" , "Bring in - cause to meet" , "Present (someone) by name" , "Make known to by way of reduction" , "Make one person known to another" .)