Work statement on leaving prison? (7)

I believe the answer is:

cantata

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'work statement' is the definition.
'cantata' can be an answer for 'work' (I've seen this before). I'm unsure of the 'statement' bit.

'on leaving prison?' is the wordplay.
'on' says to put letters next to each other.
'leaving' becomes 'tata' (I am not sure about this - if you are sure you should believe this answer much more).
'prison?' becomes 'can' (the can is American slang for prison).
'tata' after 'can' is 'CANTATA'.

Can you help me to learn more?

(Other definitions for cantata that I've seen before include "Oratorio on a sacred theme" , "Musical piece" , "Vocal composition" , "aria" , "Short oratorio performed in concert" .)

I've seen this clue in The Times.

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