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Financial obligation to someone that is a problem, perhaps (9)

Ross

I believe the answer is:

liability

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'financial obligation' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for liability that I've seen before include "Millstone" , "duty" , "Financial obligation" , "Hindrance" , "Debt; drawback" .)

I've seen this clue in The Irish Times.
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