To put it differently, hero drowns it while going berserk (2,5,5)
I believe the answer is:
in other words
'to put it differently hero drowns it while going berserk' is the definition.
I can't tell whether this definition defines the answer.
'to put it differently hero drowns' is the wordplay.
I cannot really see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
an anagram of 'hero' is 'oher' which is present in the left over letters.
an anagram of 'drowns' is 'nwords' which is within the left over letters.
A single letter 'i' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for in other words that I've seen before include "This means" , "Putting it differently" , "Let me rephrase that" , "Expressed alternatively" , "I mean to say!" .)