I prefer to fold my AJo then a weak fish min-raise flop on Ac Tc 6d board.
If you prefer to at least defense once, I think folding AJo on turn is a better choice.

According to your description, I think CO is definitely a weak fish, if a weak fish raise me, I usually believe they have a real hand.

The squeeze is fine against a player you consider weaker and will likely call with a good chunk of dominated hands. Vs a more reggish profile I will definitely mix between overcall and squeeze.
Your hand is a good candidate to Cbet and get it in with this pot to stack ratio. He might be doing some sort of raise to get more info and/or value cutting himself. Also you don't block any of the combos draws he may be taking this line with. I would check back AJ with the jack of clubs as you need less protection.
To answer your last question - and it relates to what I wrote above: I would Cbet AQ no clubs and check with AQc. You probably want to Cbet a larger part of your AQ combos than AJ though: a bit more value and AJ is definitely a hand he can have here.

I'm calling 100% of the time vs not passive/tight fish, villian can have random hands vs your 1/3 size as well as overplaying some Ax too. Need some kind of reads to make fold on the turn, which I guess you don't have.
Having a club doesn't seems like a huge deal, probably doesn't minraise it often

Looks good. It doesn't feel great in game but, as others have said, it shouldn't surprise us if villain shows up with a random Ax hand or some complete garbage. It's going to be pretty tough to hero fold top pair with small SPR's against recreational players that we're readless against.

Hate the turn raise. I think it's a little too idealistic to believe V would overplay a hand such as A9 this badly. Weak V's can easily have AK, AQ, AT, TT and 66 here and would much prefer a turn fold, especially vs a fish showing aggression.

Yeah I know that, I just much prefer a fold on the turn. I think even the fishiest of villains would just call down with A9 and worse

Can't fold. We can't assume a nutted range from a very fishy profile.

We can disagree. We don't even know whether this is a passive fish, aggro fish or anything, all we know is OP described this player as a fish (but from what I can tell he played this hand fine). We are literally beat by everything and I have trouble believing the fishiest of villains would go this crazy with A9 and worse. As we all know, fish are terrified of AK. Easy fold on the turn in my opinion.