Types of property occupancy seen in Act rewritten (9)

I believe the answer is:

tenancies

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'types of property occupancy' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how one could define the other.

'seen in act rewritten' is the wordplay.
'rewritten' is an anagram indicator.
'seen'+'in'+'act'='seeninact'
'seeninact' is an anagram of 'TENANCIES'.

Can you help me to learn more?

(Another definition for tenancies that I've seen is " property".)

I've seen this clue in the Sydney Morning Herald.

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