Reporter's rung flat (6)
I believe the answer is:
steppe
'flat' is the definition.
(thesaurus)
'reporter's rung' is the wordplay.
'reporter's' shows a homophone (sound like) (report can mean to speak something aloud).
'rung' becomes 'step' (I've seen this before).
'step' is a homophone of 'STEPPE'.
(Other definitions for steppe that I've seen before include "Dry area of grassland in southeast Europe and Siberia" , "(Russian) grassy plain" , "Large area of unforested grassland" , "Treeless plain of Russia" , "Large treeless area of Siberia" .)