Those deep in trouble summarised information for the better (9)

I believe the answer is:

dopesheet

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'those deep in trouble summarised' is the definition.
I know nothing about this answer so I can't judge whether this works.

'information for the better' is the wordplay.
I cannot really see how this works, but
'information' could be 'dope' (dope is a kind of information) and 'dope' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

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I've seen this clue in The Independent.

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