Baffled by 19A A small stone swallowed by a bird etc to aid digestion in gizzard (10) G?S??O?A?H ?Gastro- something?? Maybe it's this hot weather.... Hope you enjoyed the golf, kk!
VMT bridgenut, where did you find that (or are you an ornithologist...?) But what does that make 17D, 'cos I have Liaria (courtesy of Mr Google/Wikipedia)