Crossword Genius

Which legal documents believe in performances? (5,5)

Ross

I believe the answer is:

trust deeds

I'm a little stuck... Click here to teach me more about this clue!

'performances?' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'which legal documents believe' is the wordplay.
I cannot quite see how this works, but
'documents' could be 'deeds' (deed is a kind of document) and 'deeds' is found within the answer.
'believe' could be 'trust' (trusting is a kind of believing) and 'trust' is present in the answer.
No letters remain.
This explanation may well be incorrect...

'in' is the link.

Can you help me to learn more?

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