Nurse in Sartre attractive (5)
I believe the answer is:
treat
'nurse' is the definition.
(I've seen this before)
'in sartre attractive' is the wordplay.
'in' says the answer is hidden in the clue.
'TREAT' can be found hidden inside 'sartre attractive'.
(Other definitions for treat that I've seen before include "Shout" , "Doctor, manage" , "Pay for someone's food or entertainment" , "pay for another" , "Stand a drink" .)