Money one may charge in Africa (5)

I believe the answer is:

rhino

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'money' is the definition.
(old-fashioned slang term for money)

I don't understand how the rest of the clue works.

(Other definitions for rhino that I've seen before include "one might charge in Africa" , "Thick-skinned animal (abbr) - money (slang)" , "Large African pachyderm" , "In brief, large thick-skinned animal of Africa" , "Animal hunted for its horn" .)

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

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