Girl from Castle Vale (3)
I believe the answer is:
eva
'girl' is the definition.
(girl's name)
'from castle vale' is the wordplay.
'from' says the answer is hidden in the clue.
'EVA' is hidden within 'castle vale'.
(Other definitions for eva that I've seen before include "Maria -- Duarte De Peron" , "Girl's name; extravehicular activity (abbreviation)" , "Braun or Peron, say" , "Girl's name; space walk" , "Dame - - Turner, soprano" .)