Several factors for clank on ANY bass....
Each saddle has a couple of grubs.
Pickups have screws.
Neck has a truss rod.
Nut has slots.
Board has frets.
All that falls under fretwork and setup.
Control plate has two Vs and a T.
That falls under knowing what is available and how to properly utilize such.
Then there are picking/plucking and fretting...
Different folks do not play the same...
That falls under player technique.
To make a blanket statement can sometimes be a bit silly...
If 'clanky'? Setup, Controls, Player, one or more of those....
If I said P bass necks played like whale tish, some would go full spidermonkey, some would tell my to GFM, and a few would say WHICH P neck I was referring to and if I had played said neck long enough to acclimate.
A good friend of mine that is an incredible player, plays a bit heavier than I do. He bitches when he plays my basses because he has to play a lot more lightly on mine than his....
When he first sits down with one of mine, he's clanky. Why?
After a few minutes, he's not clanky, rather smooth as silk, and bitches at me because my basses play too freaking easy. Why?
Same bass, a few minutes apart, clanky and not clanky. Why?
On my fivers, I was using D_SBs and loved em except the B was clanky (tension) unless I played very very lightly on the B...
I changed to NYXLs. The B is not clanky.
That was on Stein, Ray, Dimension, Jazz, PJ.... Piece of tish clanky basses? Nawt.
Just bought another Jazz.... DRs on it.... Clanky ass bass... until I did a setup on it...
Now, if it clanks, you're doing it wrong... because it damn sure ain't the bass....