Broken seats are part of the estate (5)
I believe the answer is:
asset
'part of the estate' is the definition.
The answer and definition can be both related to property as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'broken seats' is the wordplay.
'broken' indicates anagramming the letters.
'seats' is an anagram of 'ASSET'.
'are' is the link.
Can you help me to learn more?
(Other definitions for asset that I've seen before include "A possession of some value" , "Valuable person" , "Plus point" , "Holding" , "Item of property" .)