Be very scornful about terrible evil (6)
I believe the answer is:
revile
'be very scornful' is the definition.
I can't tell whether this definition defines the answer.
'about terrible evil' is the wordplay.
'about' becomes 're' (regarding).
'terrible' indicates anagramming the letters.
'evil' anagrammed gives 'vile'.
're'+'vile'='REVILE'
Can you help me to learn more?
(Other definitions for revile that I've seen before include "Abusively criticise" , "Upbraid, berate" , "Vilify" , "Upbraid or abuse" , "Criticise in abusive language" .)