Financially, many are best settled by arrangement (5)

I believe the answer is:

debts

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'financially many are best settled by arrangement' is the definition.
I can't judge whether this definition defines the answer.

'financially many are best settled' is the wordplay.
'financially many' becomes 'd' (Roman numeral for 500. I am not sure about the 'financially' bit.).
'settled' indicates anagramming the letters.
'best' with letters rearranged gives 'ebts'.
'd'+'ebts'='DEBTS'

Can you help me to learn more?

(Other definitions for debts that I've seen before include "Monies owed" , "Amounts owed" , "Liabilities" , "Outstanding sums" , "Moneys owed" .)

I've seen this clue in the Evening Standard.

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