That woman from Chertsey (3)
I believe the answer is:
her
'that woman' is the definition.
('her' refers to a woman)
'from chertsey' is the wordplay.
'from' indicates a hidden word.
'HER' is hidden within 'chertsey'.
(Other definitions for her that I've seen before include "Belonging to a female" , "The woman's" , "Pronoun used of ship" , "Belonging to the woman" , "She, objectively" .)