Chore to get old queen South African money (6)
I believe the answer is:
errand
'chore' is the definition.
(I've seen this in another clue)
'get old queen south african money' is the wordplay.
'get' says to put letters next to each other.
'old queen' becomes 'ER' (Elizabeth Regina, ie Queen Elizabeth).
'south african money' becomes 'rand' (currency of South Africa).
'er' put next to 'rand' is 'ERRAND'.
'to' is the link.
(Other definitions for errand that I've seen before include "Mission (often run)" , "Mission (usually run!)" , "Short trip for a message" , "Messenger's job" , "Short commission" .)