Millions supporting newly-formed native country (7)
I believe the answer is:
vietnam
'country' is the definition.
(Vietnam is an example)
'millions supporting newly-formed native' is the wordplay.
'millions' becomes 'm' (abbreviation).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'newly formed' indicates an anagram.
'native' is an anagram of 'vietna'.
'm' after 'vietna' is 'VIETNAM'.
(Other definitions for vietnam that I've seen before include "Asian land" , "country abroad" , "former war zone" , "Ho Chi Minh's country" , "South-east Asia country" .)