I'm afraid I've arrived rather late to the party, and I do feel bad asking for help when I'm probably not in time to give any... I also feel very foolish because I know my one gap, at 11d, must be very easy and obvious. "Penniless ceramicist's studio" is clearly a setter and clearly so sort of play on (p)OTTERY, but as it's 8 letters, I'm stumped. I have O-T-R-E- and am fairly confident those are all correct unless someone can tell me otherwise?