Crossword Genius

What mum does, receiving letters about the future for Bill? (3,2,10)

Ross

I believe the answer is:

act of parliament

'future for bill?' is the definition.
(a parliamentary bill might become an act of law)

'what mum does receiving letters about the' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'of' and 'of' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
This explanation may well be incorrect...

(Other definitions for act of parliament that I've seen before include "Bill approved" , "Law" , "Statute" .)

I've seen this clue in The Guardian.
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