Another Word for an Arbitrator or Negotiator

This page is the CodyCross answer for the clue below from Cats, Group 1722, Puzzle 1 (Hissing to Defend).

Question is: Another Word for an Arbitrator or Negotiator

and the answer is: MEDIATOR

Word Meaning:

MEDIATOR — One who negotiates between parties seeking mutual agreement.

Definitions from Wiktionary.