Regret taking away European politician's seat (4)
I believe the answer is:
rump
'seat' is the definition.
(I know that seat can be written as rump)
'regret taking away european politician's' is the wordplay.
I cannot really understand how this works, but
'politician' could be 'mp' (Member of Parliament) and 'mp' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rump that I've seen before include "Animal's hind quarters" , "Type of steak" , "Bottom - cut of steak" , "Depleted legislators" , "Cut of meat from the rear" .)