Reported new part of speech within one day (9)
I believe the answer is:
announced
'reported' is the definition.
(I've seen this before)
'new part of speech within one day' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'part of speech' becomes 'noun' (noun is a part of speech).
'within' means one lot of letters goes inside another.
'one' becomes 'ace' (ace has a value of one in some card games).
'day' becomes 'd' (abbreviation for day).
'n'+'noun'='nnoun'
'nnoun' placed inside 'ace' is 'announce'.
'announce'+'d'='ANNOUNCED'
(Other definitions for announced that I've seen before include "Proclaimed" , "Declared publicly" , "Revealed" , "reported" , "published" .)