Arab nation reversed hold on island (7)
I believe the answer is:
kuwaiti
'arab' is the definition.
(I've seen this before)
'nation reversed hold on island' is the wordplay.
I cannot really see how this works, but
'nation' could be 'kuwait' (Kuwait is an example) and 'kuwait' is present in the answer.
'island' could be 'i' (geographical abbreviation) and 'i' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for kuwaiti that I've seen before include "Gulf state citizen" , "From an Eastern Arabian country" , "Arab" , "Native of a Gulf state" .)