Juan's wife (3)
I believe the answer is:
eva
'juan's wife' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eva that I've seen before include "-- Pern" , "Dame - - Turner, 15" , "Little --, US pop singer" , "Dame - - Turner, soprano" , "-- Braun, Hitler mistress" .)