European lecturer to harangue voters (10)

I believe the answer is:
electorate
'voters' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for electorate that I've seen before include "Voters in general" , "Those qualified to vote" , "Everyone choosing" , "Constituency" , "choosing body" .)
