She's in the van (3)
I believe the answer is:
eva
'she's' is the definition.
'in the van' is the wordplay.
'in' says the answer is hidden in the clue.
'EVA' is hidden in the letters of 'the van'.
(Other definitions for eva that I've seen before include "-- Peron, Argentinian First Lady" , "Braun or Peron, say" , "-- Pern" , "Braun, Brick or Peron" , "Maria -- Duarte De Peron" .)