The murderer in the soap? (6,6)
I believe the answer is:
serial killer
'the murderer' is the definition.
(serial killer is a kind of murderer)
'soap?' is the wordplay.
I cannot really understand how this works, but
'soap?' could be 'serial' (I've seen this before) and 'serial' is found within the answer.
The remaining letters 'killer' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'in the' is the link.
Can you help me to learn more?
(Other definitions for serial killer that I've seen before include "Regular butcher" , "One carrying out a run of murders" , "Mass murderer" , "One perpetrating many murders at different times" .)