The phrase "party individual" refers to a person who enjoys or is enthusiastic about attending parties. They like socializing, dancing, and having fun with others in a party setting. Full definition
It was assumed that the parents have right to custody over their child over any other third party individual. (ourfamilywizard.com)
We do not disclose personal information collected to any third party individuals, organizations, businesses, associations, or corporations. (onthegohgoh.com)
Asked what would happen if a new leader tried to change policy to support Nato withdrawal, he said: «There's always been in the history of the Labour party individuals who take different positions. (theguardian.com)