Sauce student found in South Africa, doubled (5)
I believe the answer is:
salsa
'sauce' is the definition.
(I've seen this before)
'student found in south africa doubled' is the wordplay.
'student' becomes 'L' (as in L-plates for learner drivers).
'found in' indicates putting letters inside.
'south africa' becomes 'SA' (abbreviation).
'doubled' shows that letters should be duplicated.
'sa' duplicated is 'sasa'.
'l' going into 'sasa' is 'SALSA'.
(Other definitions for salsa that I've seen before include "Chilli sauce" , "that's hot and saucy?" , "dancing?" , "Latin-American dance" , "dressing" .)