Crossword Genius

Make theist give up dollars? (5)

Ross

I believe the answer is:

tithe

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This clue could be a double definition.

'make theist' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'give up dollars?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

Can you help me to learn more?

(Other definitions for tithe that I've seen before include "Tenth of income given to church" , "Tax paid to church" , "property tax" , "financial contribution" , "Source of church revenue" .)

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