This part of Somalia is in Africa, of course (4)
I believe the answer is:
mali
'this part of somalia is in africa of course' is the definition.
'mali' can be an answer for 'part' (I have seen 'part of Africa' mean 'mali' so perhaps 'part' could also mean 'mali'). I am not certain of the rest of the definition.
'this part of somalia is in' is the wordplay.
'this part of' indicates the answer is hidden within the clue.
'MALI' is hidden in the letters of 'somalia in'.
Can you help me to learn more?
(Other definitions for mali that I've seen before include "Send mail out to Africa" , "West African country, capital Bamako" , "Timbuktu is in this landlocked country" , "Land" , "African state's" .)