Bad-tempered Republican leader ejected by CO (5)
I believe the answer is:
cabby
'bad-tempered republican leader' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'ejected by co' is the wordplay.
I cannot really understand how this works, but
'by' is present in the answer.
The remaining letters 'cab' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
(Other definitions for cabby that I've seen before include "Taxi-driver" , "Taxi driver" .)