Misbehaving Mack did not harass anybody (3,4,3,5)
I believe the answer is:
tom dick and harry
'anybody' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'misbehaving mack did not harass' is the wordplay.
'misbehaving' indicates an anagram.
'harass' becomes 'harry' (synonyms).
'mack'+'did'+'not'='mackdidnot'
'mackdidnot' is an anagram of 'tomdickand'.
'tomdickand'+'harry'='TOM DICK AND HARRY'
Can you help me to learn more?
(Other definitions for tom dick and harry that I've seen before include "Anyone" , "Ordinary people" , "Being basic geezer" .)