Russian king court occasionally expelled (4)
I believe the answer is:
igor
'russian' is the definition.
(common Russian name)
'king court occasionally expelled' is the wordplay.
I cannot quite see how this works, but
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is present in the answer.
The remaining letters 'igo' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for igor that I've seen before include "Card game" , "Russian boy" , "Maybe 8 [SIKORSKY]" , "Russian man" , "Stravinsky, perhaps" .)