6d) Bitter republican tapped in mix-up (5) H????
13a) Clue he's been endlessly deciphering in last course perhaps (4,6) no ltrs
15a) Lacking ability to pen story? That's puzzling (13) ??A???????B??
19A) Bust RN diver seen netting one hundred plates etc. (6,7) D???E? ??????E
All help greatly appreciated.