Turned away — one nurse in particular upset (9)
I believe the answer is:
alienated
'turned away' is the definition.
'one nurse in particular upset' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'nurse' becomes 'en' (abbreviation for enrolled nurse).
'in' indicates putting letters inside.
'particular' becomes 'detail' (synonyms).
'upset' is a reversal indicator.
'detail' reversed gives 'liated'.
'en' inserted into 'liated' is 'lienated'.
'a'+'lienated'='ALIENATED'
(Other definitions for alienated that I've seen before include "disaffected" , "divorced" , "Date Liane (anag.)" , "put off" , "Estranged" .)