Island in South Africa with giant old bird (5)
I believe the answer is:
samoa
'island' is the definition.
(Samoa is an example)
'in south africa with giant old bird' is the wordplay.
'in' means one lot of letters goes inside another.
'south africa' becomes 'SA' (abbreviation).
'with giant old bird' becomes 'amo' (I can't justify this - if you can you should believe this answer much more).
'sa' enclosing 'amo' is 'SAMOA'.
Can you help me to learn more?
(Other definitions for samoa that I've seen before include "Commonwealth country in the Pacific, capital Apia" , "Southwest Pacific island group" , "South Pacific island country, gaining its independence from New Zealand in 1962" , "South-west Pacific nation" , "Pacific island nation, capital Apia" .)