AAKTss UTG what you do on flop ?

Easy stack off.

A donk bet on the flop is very often some kind of draw or a vulnerable made hand like 2 pair, but rarely a set (though sometimes weak players do this!)

I would happily raise here knowing I have good equity against my opponents range and of course stack off.

Yep I raised here and he called, the turn was an 8 of clubs, and there I was lost .... What is my play on turn ? If he donks ? If he checks ?

If he checks I check back. I dont like to bluff double suited boards.

If he donks pot I fold.

If he donks half pot I call.

The 8 hitting is definitely a good spot to take a free card. You now lose to a lot of straight wraps that have made either a straight (987x) or 2 pair (T98x)