Religions bring in public relations information for wrongdoers (8)
I believe the answer is:
culprits
'for wrongdoers' is the definition.
(culprit is a kind of wrongdoer)
'religions bring in public relations information' is the wordplay.
'religions' becomes 'cults' (cult is a kind of religion).
'bring in' means one lot of letters goes inside another.
'public relations' becomes 'PR' (abbreviation).
'information' becomes 'i' (common abbreviation for information).
'pr'+'i'='pri'
'cults' going around 'pri' is 'CULPRITS'.
(Other definitions for culprits that I've seen before include "They're the ones to blame" , "They perpetrate wrongdoing" .)