The rabble foil centrists after hours, and after election (3,6)
I believe the answer is:
hoi polloi
'the rabble' is the definition.
(I've seen this before)
'foil centrists after hours and after election' is the wordplay.
I cannot quite see how this works, but
'hours' could be 'h' and 'h' is located in the answer.
'election' could be 'poll' (I've seen this before) and 'poll' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hoi polloi that I've seen before include "The common people generally" , "ordinary people" , "The common people - in Greece" , "(Often derogatory) term for the masses or common people" , "commoners" .)