After much procrastinating, I found that the little clamp secured nicely to the point where the straps are attached to the bag above the hip belt, which puts the DSLR at your hip.
Seems pretty secure in that location though isn't as accessible as if it was attached to a strap. It can be removed one handed but to reattach requires spinning the bag off one shoulder - not a massive hardship.
Were you stalking me last week, as I did exactly that, more comfortable than on the shoulder strap.
I didn't have much problem putting it back on though.