He does all work under tenancy agreement (9)

I believe the answer is:

leasehold

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'under tenancy agreement' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'he does all work' is the wordplay.
'work' indicates an anagram.
'he'+'does'+'all'='hedoesall'
'hedoesall' is an anagram of 'LEASEHOLD'.

Can you help me to learn more?

(Other definitions for leasehold that I've seen before include "property that's let" , "Type of tenure" , "Rented land" , "Form of property tenure" , "rented property" .)

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

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