Monetary unit in South Africa (4)
I believe the answer is:
rand
'monetary unit in south africa' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rand that I've seen before include "Currency of South Africa" , "South African money" , "our 1/4 Across [GOLD MEDALLIST] in 1964" , "Overseas money" , "Monetary unit in South Africa" .)