Crossword Genius

Disturbed when in arrears? (9)

Ross

I believe the answer is:

unsettled

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'disturbed' is the definition.
(I know that disturbed can be written as unsettled)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for unsettled that I've seen before include "Disturbed" , "lawless" , "Not sure" , "(Of weather) lacking stability" , "Missing work by composer, perhaps" .)

I've seen this clue in The Sun.
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