A sortie backfiring in Nubia as agitating for Middle Easterner (5,7)

I believe the answer is:

saudi arabian

I'm a little stuck... Click here to teach me more about this clue!

'middle easterner' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'a sortie backfiring in nubia as agitating' is the wordplay.
'sortie' becomes 'raid' (I've seen this in another clue).
'backfiring' says the letters should be written backwards.
'in' means one lot of letters goes inside another.
'agitating' indicates an anagram.
'a'+'raid'='araid'
'araid' backwards is 'diara'.
'nubia'+'as'='nubiaas'
'nubiaas' with letters rearranged gives 'saubian'.
'diara' going inside 'saubian' is 'SAUDI ARABIAN'.

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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