Bracketing together of dads perhaps by one: both evil and good (14)

'bracketing together' is the definition.
(putting in brackets or parentheses)

'dads perhaps by one both evil and good' is the wordplay.
I cannot really understand how this works, but
'one' could be 'the' (both can introduce a definite example of something) and 'the' is located in the answer.
'evil' could be 'sin' (synonyms) and 'sin' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
'good' could be 'g' (abbreviation) and 'g' is located in the answer.
This may be the basis of clue (or it may be nonsense).

'of' acts as a link.