Crossword Genius

A charge made upon income? (8,3)

Ross

I believe the answer is:

entrance fee

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'a charge' is the definition.
(entrance fee is a kind of charge)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for entrance fee that I've seen before include "Getting in charge" , "Admission charge" .)

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