Awful rant merits further broadcast (10)
I believe the answer is:
retransmit
'further broadcast' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.
'awful rant merits' is the wordplay.
'awful' is an anagram indicator.
'rant'+'merits'='rantmerits'
'rantmerits' with letters rearranged gives 'RETRANSMIT'.
Can you help me to learn more?
(Other definitions for retransmit that I've seen before include "Send (message) again" , "Broadcast again" .)