If people are not to, vaster redistribution is required (6)
I believe the answer is:
starve
'if people are not' is the definition.
I can't judge whether this definition defines the answer.
'vaster redistribution is required' is the wordplay.
'redistribution is required' indicates anagramming the letters (letters must be redistributed to new positions).
'vaster' anagrammed gives 'STARVE'.
'to' acts as a link.
(Other definitions for starve that I've seen before include "Deprive of food" , "Stop feeding" , "Suffer from want of food" , "Eat nothing" , "Die from lack of food" .)