Divine law associated with electoral system (7)
I believe the answer is:
predict
'divine' is the definition.
(I've seen this before)
'law associated with electoral system' is the wordplay.
'law' becomes 'edict' (I've seen this before).
'associated with' is a charade indicator (letters next to each other).
'electoral system' becomes 'pr' (proportional representation).
'edict' put after 'pr' is 'PREDICT'.
(Other definitions for predict that I've seen before include "Foretell, prophesy" , "Divine" , "Estimate consequence of" , "Forecast" , "Foresee" .)