Carter of sitcomdom (4)
I believe the answer is:
nell
'carter of sitcomdom' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nell that I've seen before include "-- Gwyn, royal favourite" , "Dickensian heroine" , "-- Gwyn, 17th-century actress" , "Little -, (Dickens char.)" , "little Miss Trent?" .)