Chance of money abroad lifted doctor (6)
I believe the answer is:
random
'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'.
'rand'+'om'='RANDOM'
'of' is the link.
(Other definitions for random that I've seen before include "Without pattern" , "Disorganised" , "'Haphazard, irregular (6)'" , "Haphazard, occuring by chance" , "Lacking a pre-planned pattern" .)