Shouted or read about (6)
I believe the answer is:
roared
'shouted' is the definition.
(roaring is a kind of shouting)
'or read about' is the wordplay.
'about' is an anagram indicator.
'or'+'read'='orread'
'orread' anagrammed gives 'ROARED'.
(Other definitions for roared that I've seen before include "Bellowed, thundered" , "Yelled" , "Made long loud sound like lion" .)