I think you are right - it looks like a clearwing moth (family Sesiidae). Possibly in the genus Synanthedon?

Thank you :) after a few hours looking I found out it was Virginia Creeper Clearwing.... quite stunning. I think this might be an elderly moth, the wings are a bit tattered and so is the tail.

It certainly doesn't look fresh; but the tail is supposed to be comb-like. Some indications of wear and tear would be loss of furry hairs on top of the thorax and loss of all iridescence on the wings and body.