One of Chekhov's "Three Sisters” (4)
I believe the answer is:
olga
'one of chekhov's three sisters' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for olga that I've seen before include "Slavic girl's name" , "Russian girl's name, anagram of ..." , "Could be Russian girl" , "Lady" .)