Island volunteers greeting the immigrants initially (6)
I believe the answer is:
tahiti
'island' is the definition.
(Tahiti is an example)
'volunteers greeting the immigrants initially' is the wordplay.
'volunteers' becomes 'ta' (abbreviation for Territorial Army).
'greeting' becomes 'hi' (hi is a kind of greeting).
'initially' indicates taking the first letters.
The first letters of 'the immigrants' is 'ti'.
'ta'+'hi'+'ti'='TAHITI'
(Other definitions for tahiti that I've seen before include "Island in South Pacific, chief town Papeete" , "Pacific island, Gauguin's home in the 1890s" , "Polynesian island, chief town Papeete" , "One of the Society Islands" , "South Pacific island, capital Papeete" .)