Hi, wnbMG!
Interesting spot.
I had one approach facing these donk bet spots from weak players and recently I've been told I was wrong. I'll tell you the two views and ask a second opinion from Veriz.
What I did: I just turned my hand there in a bluff and raised him. Because on an A high, semy dry flop like that the best hand he has is a weak Ax or flush draw. Often they are betting to either scare you because you missed yourself, or to "know where they are at". Many of them will fold 100% of the time if you raise; some will never ever fold. So you just have to find out who is who and adapt.
What I was told: you can never try to make a loose/bad player fold his top pair. If he has anything else we're ahead thus the best is to just call and let him bluff again. If a club hit on the turn we still have the redraw to the nuts; if a club hits on the river he have an easier fold.
That said, if you are not sure on those spots, don't know your opponent yet and risk either winning a small pot or losing a bad one, the best play is probably to fold and wait for a better spot to get his money; the way he is playing that shouldn't be too hard. Just don't forget to make a note on him.