Crossword Genius

Paid work? (4)

Ross

I believe the answer is:

duty

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'work?' is the definition.
(duty is a kind of work)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for duty that I've seen before include "A tax; compulsory task" , "Financial or work obligation" , "Task; military service" , "Kind of obligation or tax" , "Service - tax - office" .)

I've seen this clue in the Evening Standard.
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