Crossword Genius

One's occupation may require this regular payment (6)

Ross

I believe the answer is:

rental

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'payment' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for rental that I've seen before include "To do with a letting" , "Cost of hire" , "Amount paid for hire" , "Learnt (anag) -- lease" , "Amount paid for hiring something" .)

I've seen this clue in The Globe and Mail.
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