A robin flies around island capital (7)
I believe the answer is:
nairobi
'capital' is the definition.
(Nairobi is an example)
'a robin flies around island' is the wordplay.
'flies around' indicates an anagram.
'island' becomes 'i'.
'a'+'robin'='arobin'
'arobin' anagrammed gives 'nairob'.
'nairob'+'i'='NAIROBI'
(Other definitions for nairobi that I've seen before include "Flat round object" , "City of Kenya" , "Kenyan capital" , "East African capital" , "Robinia strangely found in Kenya" .)