For heathen, US lawyer causes publicity (10)
I believe the answer is:
propaganda
'publicity' is the definition.
(I've seen this before)
'for heathen us lawyer' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'heathen' becomes 'pagan' (both can mean an irreligious person).
'us lawyer' becomes 'DA' (abbreviation for District Attorney).
'pro'+'pagan'+'da'='PROPAGANDA'
'causes' is the link.
(Other definitions for propaganda that I've seen before include "publicity material" , "Organised spreading of information or rumour" , "Goebbels' responsibility" , "Hype" , "PR" .)