Crossword Genius

An obligation to produce tax (4)

Ross

I believe the answer is:

duty

I believe this clue is a double definition.

'an obligation' is the first definition.
(I know that obligation can be written as duty)

'tax' is the second definition.
(duty can mean a tax or toll)

'to produce' acts as a link.

(Other definitions for duty that I've seen before include "Obligatory task(s) - tax" , "Task; military service" , "Financial or work obligation" , "Tax - burden" , "Allegiance" .)

I've seen this clue in the Sydney Morning Herald.
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