Like hell cats in a melee (7)
I believe the answer is:
satanic
'like hell cats in a melee' is the definition.
I can't judge whether this definition defines the answer.
'cats in a melee' is the wordplay.
'melee' indicates an anagram.
'cats'+'in'+'a'='catsina'
'catsina' with letters rearranged gives 'SATANIC'.
Can you help me to learn more?
(Other definitions for satanic that I've seen before include "Like the Devil" , "Devilish, like Blake's mills" , "Relating to the devil" , "Diabolical" , "Devil-like" .)