Girl superstar going round South Africa (5)
I believe the answer is:
susan
'girl' is the definition.
'superstar going round south africa' is the wordplay.
'superstar' becomes 'sun' (I am not sure about this - if you are sure you should believe this answer much more).
'going round' is an insertion indicator (some letters go around others).
'south africa' becomes 'SA' (abbreviation).
'sun' going around 'sa' is 'SUSAN'.
Can you help me to learn more?
(Other definitions for susan that I've seen before include "- - Sarandon, film actress" , "When lazy, she's a revolving tray on a dining table" , "Girl's name; lazy -" , "Girl (sometimes lazy?)" , "She's a black-eyed flower" .)