For some housemistresses, there's nothing quite final about them (5)

I believe the answer is:

semis

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'nothing quite final about them' is the definition.
I can't tell whether this defines the answer.

'for some housemistresses' is the wordplay.
'SEMIS' is hidden in amongst the letters.
However, I am uncertain how the hidden word is indicated.

'there's' is the link.

Can you help me to learn more?

(Other definitions for semis that I've seen before include "Paired houses" , "Suburban houses" , "They transport" .)

I've seen this clue in the Evening Standard.

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