Nothing in Islam affected man from Mogadishu (6)

I believe the answer is:

somali

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'man from mogadishu' is the definition.
I can't tell whether this definition defines the answer.

'nothing in islam affected' is the wordplay.
'nothing in' becomes 'o' (I've seen this in other clues).
'affected' indicates anagramming the letters.
'o'+'islam'='oislam'
'oislam' is an anagram of 'SOMALI'.

Can you help me to learn more?

(Other definitions for somali that I've seen before include "North-east African" , "Native of East African state" , "East African national" , "1 [GCSE]" , "Eg, native of Mogadishu" .)

I've seen this clue in the Sydney Morning Herald.

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