African heart-throb — girls must turn up to show! (4)
I believe the answer is:
igbo
'african' is the definition.
(the Igbo are a Nigerian ethnic group)
'heart-throb girls must turn up to show' is the wordplay.
'to show' says the answer is hidden in the clue.
'must turn up' is a reversal indicator.
'obgi' can be found hidden inside 'heart throb girls'.
'obgi' back-to-front is 'IGBO'.
(Other definitions for igbo that I've seen before include "Nigerian language" , "language in Nigeria" , "people abroad" .)