Broadcast most about river furore (5)
I believe the answer is:
storm
'furore' is the definition.
(I've seen this before)
'broadcast most about river' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'about' indicates putting letters inside.
'river' becomes 'r' (abbreviation for river).
'most' with letters rearranged gives 'stom'.
'stom' going around 'r' is 'STORM'.
(Other definitions for storm that I've seen before include "Big fuss" , "Violent outburst" , "violent reaction" , "Trouble" , "Uproar" .)