Chance of money abroad lifted doctor (6)
I believe the answer is:
Here is my best explanation:
'chance' is the definition.
('random' can be similar in meaning to 'chance')
'money abroad lifted doctor' is the wordplay.
'money abroad' becomes 'rand' (currency of South Africa).
'lifted' shows that the letters should be reversed in order (going up in down clue).
'doctor' becomes 'mo' (medical officer**).
'mo' reversed gives 'om'.
'of' is the link.
(Other definitions for random that I've seen before include "Haphazard, occuring by chance", "Without pattern", "Chance, haphazard", "unmethodical", "Lacking regularity", "Chance, irregular", "casual?", "Roderick came before it", "Haphazard, hit or miss" and "Unplanned".)