Actress Kurylenko or gymnast Korbut (4)
I believe the answer is:
olga
I believe this is a double definition.
'actress kurylenko' is the first definition.
(I've seen this in another clue)
'gymnast korbut' is the second definition.
(I've seen this in another clue)
(Other definitions for olga that I've seen before include "Lady" , "Could be Russian girl" , "Slavic girl's name" , "Russian girl's name, anagram of ..." .)