1) UK party 2) Ad add-on 3) Ad addition 4) Ad attachment 5) Ad closing 6) Ad conclusion 7) Ad ender 8) Ad ending 9) Ad follower 10) Ad or Mad follower 11) Ad trailer 12) Brief freedom 13) Empowerment term 14) Empowerment word 15) End of a cause 16) Equal rights term 17) Freedom of movement 18) Left-leaning pol Found on https://www.crosswordclues.com/clue/lib