Good point. "Fair" is hopelessly vague. Maybe you can clarify.
In my experience "fair" is generally invoked when someone wants to justify state interference in the free market, because freedom produced a result that they don't like.
Fair Trade would be trade that is mutually beneficial to both sides. ie NOT a massive and ever growing trade deficit.
It is a general position, but clear enough.
What problem do you have with that position?