thanks all. blowing upside down did the trick for me, as does the hard, quick swing of the tank (with our without battery) to expel the juice into a tissue.
but both of the above only fix the problem after they happen.
i'm learning though that adjusting my draw to continue drawing after releasing the button makes a big difference in preventing the gurgling issues in the first place with bottom coil clearos. (takes a while to get used to this - it's seems quite unintuitive.) my guess it that uninhaled vapour is recondensing in the tube, and then causing liquid build up in the tube which in turn causes the gurgle...