Wow, very impressed with the move by villain.
I couldnt fold that straight although knowing the guys hand, and what he bet, you should.
The chance that hes either a)bluffing b) thinks you dont have the straight and is betting non-two clubed striaght for value would be enough to make me call... Even if he was a solid rock, anyone can change their play at any time. You should never be 100% sure someone isnt bluffing.

Again this is a psychological read, he could even think you put him on two clubs and an ace and is out thinking you.

Regardless, great hand