Unless you're playing upside down there is no need to clamp..........
There have been threads in the past on mounting a tom on a snare stand and whether this chokes the drum. It does.
I use the Ludwig Pro II snare stand with my tom which allows me to get the drum snug without choking it. It comes at the drum at a different angle and has some small isolation mounts that match up to a standard rim. I've done side-by-side comparisons and it really does what Ludwig claims it does - not choke the drum.
I've been thinking of getting another to replace my snare stand.
To me clamping the drum in the stand sounds like you're pressing three fingers against the shell/rim somewhat tightly. That has to effect the shell's ability to resonate and the resonance is what I love about drums. They just sound more musical with it in there.