Var of var in Ansible Playbook

Hello,
i try to do a var of var in a playbook on Ansible but i can’t figure out how to do this proprly, or if it is even possible ?
here is what i try to do :
"name : {{ groups['{{ ANOTHER_VAR_HERE }}'][0] }}"
Ansible --version : ansible 2.1.0.0

PS : ANOTHER_VAR_HERE its a variable that i include from a vars file (its not a String its a real variable)

Thank you

mustaches don't stack, just use the var

name : {{ groups[ANOTHER_VAR_HERE][0] }}"