Mrs Macpherson's property? (4)

I believe the answer is:

hers

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'property?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'mrs macpherson's' is the wordplay.
'HERS' is hidden within the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for hers that I've seen before include "The woman's" , "Belonging to the female" .)

I've seen this clue in the Evening Standard.

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