USSR first of '65 (3)
I believe the answer is:
eva
'ussr first of '65' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eva that I've seen before include "-- Cassidy, singer, 1963-96" , "Miss Peron, perhaps" , "Girl's name; extravehicular activity (abbreviation)" , "-- Braun, Hitler's wife" , "-- Pern" .)