Politician's lying finally finished – and also not (8)
I believe the answer is:
governor
'politician's' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'lying finally finished and also not' is the wordplay.
'finally' indicates one should take the final letters.
'finished' becomes 'over' (over can mean finished or ended).
'and also not' becomes 'nor' ('nor' means 'and also not').
The last letter of 'lying' is 'g'.
'g'+'over'+'nor'='GOVERNOR'
Can you help me to learn more?
(Other definitions for governor that I've seen before include "Ron, go run up the state head" , "Device that controls, speed of an engine" , "One exercising authority" , "person put in charge" , "Official in charge of prison" .)