Reportedly stop some states (4)
I believe the answer is:
bloc
'some states' is the definition.
(bloc can mean a political grouping of countries)
'reportedly stop' is the wordplay.
'reportedly' shows a homophone (sound like).
'stop' becomes 'block' (synonyms).
'block' sounds like 'BLOC'.
(Other definitions for bloc that I've seen before include "Group of allied nations" , "Nations grouped for a purpose" , "League" , "Political allies" , "Political group of nations" .)