A ranter's ridiculous reports (8)
I believe the answer is:
narrates
'reports' is the definition.
'a ranter's ridiculous' is the wordplay.
'ridiculous' is an anagram indicator.
'a'+'ranters'='aranters'
'aranters' with letters rearranged gives 'NARRATES'.
(Other definitions for narrates that I've seen before include "Tells (a story)" , "Recites, recounts" , "provides an account" .)