You are actually totally wrong, Muay Thai includes a lot of standing clinchwork including throws from the clinch.
LOL I sparred with an MT Guy just a few months back and he did everything
from the clinch or so it seemed. His technique was very Aikido like Jab Jab Kick Kick and Enter...Clinch and Dirty Box...
And those knees
Nope Aikido does not work very well in the clinch...