A good many brought in to hound prostitutes’ activity (8)
I believe the answer is:
harlotry
'prostitutes' activity' is the definition.
'harlotry' can be an answer for 'activity' (harlotry is a kind of activity). I am not sure about the 'prostitutes'' bit.
'a good many brought in to hound' is the wordplay.
'a good many' becomes 'lot' (a good many can mean a lot).
'brought in to' is an insertion indicator.
'hound' becomes 'harry' (both can mean to harass).
'lot' put into 'harry' is 'HARLOTRY'.
Can you help me to learn more?
(Other definitions for harlotry that I've seen before include "promiscuous activity" , "Prostitution" , "sexual activity" .)