Kuwait’s capital Arabs are changing old settlement (5,4)
I believe the answer is:
skara brae
'old settlement' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'kuwait's capital arabs are changing' is the wordplay.
'capital' says to take the initial letters.
'changing' is an anagram indicator.
The first letter of 'kuwaits' is 'k'.
'k'+'arabs'+'are'='karabsare'
'karabsare' with letters rearranged gives 'SKARA BRAE'.
Can you help me to learn more?
(Another definition for skara brae that I've seen is " Orkney Neolithic village".)