### Clue: Study of doctors supported by Irish diocese without reservation (8)
### Answer: ENTIRELY 
 ### Explanation: Definition: without reservation
 ENT(abbrev. for "Ear, Nose and Throat", a specialised medical practice and study) **placed above**(supported by, in a down clue) IR(abbrev. for "Irish") + ELY(the diocese in East England, famous for its cathedral).