She's in the Samaritans (4)
I believe the answer is:
rita
'she's' is the definition.
'in the samaritans' is the wordplay.
'in' says the answer is hidden in the clue.
'RITA' can be found hidden inside 'samaritans'.
(Other definitions for rita that I've seen before include "Lovely -- , meter maid (Beatles)" , "The Beatles' lovely girl" , "-- Hayworth, US film actress" , "Educating - - , film" , "subject of education" .)