The man's property in South Island (3)
I believe the answer is:
his
'the man's property in south island' is the definition.
I can't judge whether this definition defines the answer.
'in south island' is the wordplay.
'in' indicates a hidden word.
'HIS' is hidden within 'south island'.
Can you help me to learn more?
(Other definitions for his that I've seen before include "Belonging to that man" , "Belonging to the male" , "that chap's" , "It belongs to him" , "That man's" .)