Nurse from Streatham (5)
I believe the answer is:
treat
'nurse' is the definition.
(I've seen this before)
'from streatham' is the wordplay.
'from' indicates a hidden word.
'TREAT' is hidden within 'streatham'.
(Other definitions for treat that I've seen before include "Cure" , "Behave towards" , "A nice surprise" , "Entertain - minister - free entertainment" , "Practise medicine" .)