Elbows crack man, its harder and denser bone than the small fragile ones in our hands, you get hit by those its not fun, especially if you're not used to it. When you throw elbows you usually have the guard up so its tight. I wouldn't trade an elbow to give an uppercut that probably will hit guard or miss. There are tricks where you throw elbows in as you're controlling like having double bicep control (ideal), and moving to get one hard behind the neck, and elbow comes up from (analog clock pov) 3 o'clock to 12 o'clock and gripping the neck after.
if you dont know how to clinch, you're not getting lose easily. and if you do the rookie ducking out escape, a knee that was aimed at your body will end up coming to your head. And if you dont know how to clinch, you'll gas. You're in a state where you're being ragdolled and spun around as you're getting hit, your breathing is not going to be composed and it will be irregular which leads to getting gassed. You can be a great athlete, but if your breathing pattern is compromised and you are stressed, you will gas. Its one reason why people new to the sport gas even if they are superior athletes with long years of accomplishments.
The scenario you're picturing is where you somehow escape, regain your balance (and not gassed from the entire ordeal), meanwhile he's staying there surprised and stunned that you escaped, wouldn't mount an offense, won't see a telegraphed strike coming, throws a elbow (lets say a right elbow 3 to 9 o'click, instead of a spear tip), you eat it, it doesn't phase you because you're already in the motions of throwing the uppercut, it lands and he goes down.
I mean if it was a scene in a movie it could happen, but pretty unrealistic to assume the other factors. More realistic with lack of exp in clinching and elbows is to escape, keep distance and rework your kickboxing and gameplan