"The Fountainhead" author (4)
I believe the answer is:
rand
'the fountainhead author' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rand that I've seen before include "South African money" , "Unit of money in South Africa" , "South African currency unit" , "Overseas money" , "Monetary unit in South Africa" .)