Hello Jacqui,
I haven't read the book but "Priest, Politics and Society in Post-Famine Ireland" by James O'Shea Published by Wolfhound might interest you.
The writeup about the book says "It is only in recent years that a detailed examination of the power and influence of the Catholic clergy in Ireland has been forthcoming. This book is a scholarly examination of the reality of that power in the second half of the 19th century. The material used in this book has been drawn from all parts of Ireland and provides an important, highly readable and intriguing study of Irish history."
Christopher