Sodium forced into people (6)
I believe the answer is:
nation
'people' is the definition.
'sodium forced into' is the wordplay.
'sodium' becomes 'na' (chemical symbol).
'forced' indicates an anagram.
'into' with letters rearranged gives 'tion'.
'na'+'tion'='NATION'
(Other definitions for nation that I've seen before include "Anoint (anag)" , "Large community in one place under one government" , "A federation of tribes, as Native Americans say" , "Body of people united by their homeland" , "Turkey?" .)