Crossword Genius

Arrest prophet from the East -- East African (8)

Ross

I believe the answer is:

somalian

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'east african' is the definition.
'Somalian' can be an answer for 'african' (Somalian is an example). I am not sure about the 'east' bit.

'arrest prophet from the east' is the wordplay.
'arrest' becomes 'nail' ('nail' can be a synonym of 'arrest').
'prophet' becomes 'amos' (I've seen this before).
'from the east' says the letters should be written in reverse.
'nail'+'amos'='nailamos'
'nailamos' reversed gives 'SOMALIAN'.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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