Some Briton gaining islands in South Pacific (5)
I believe the answer is:
tonga
'islands in south pacific' is the definition.
'Tonga' can be an answer for 'islands' (island nation). I am not sure about the 'in south pacific' bit.
'some briton gaining' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'TONGA' is hidden within 'briton gaining'.
Can you help me to learn more?
(Other definitions for tonga that I've seen before include "Islands once ruled by Queen Salote" , "Tropic island" , "part of Polynesia" , "Two-wheeled Indian vehicle" , "group of Pacific islands" .)