Hey there, Basix.
Similar clicks are usually normal when a drive spins up or down, as the head moves to or from it's "parking spot", but could potentially be a cause for alarm if this happens while the drive is being used.
In order for you to try and find out if there's something wrong with the drive, I'd first recommend that you backup any important data which you might have on that HDD, just to be on the safe side. Then, go ahead and download the HDD manufacturer's diagnostics tool and run the tests on the drive, to see if anything alarming pops-up. You should also try the hard drive with a different computer (if possible), or at least with a different SATA port and cables on yours, to see if the problem reoccurs.
Hope that helps. Please let me know how everything goes.
Boogieman_WD