Girl in Uncle Vanya (3)
I believe the answer is:
eva
'girl' is the definition.
(girl's name)
'in uncle vanya' is the wordplay.
'in' says the answer is hidden in the clue.
'EVA' can be found hidden inside 'uncle vanya'.
(Other definitions for eva that I've seen before include "Dame - - Turner, soprano" , "Female" , "Girl's name; space walk" , "Braun or Peron, say" , "-- Peron, Argentinian First Lady" .)