Some very basic book of hours information, which might help in a general way are:
1) Roger S Wieck. TIME SANCTIFIED. The Book of Hours in Medieval Life and Art. 
(Braziller and The Walters Art Gallery, 1988).

2) John Harthan. THE BOOK OF HOURS. (Park Lan, 1982 reprint of Thames & Hudson, 1977)

3) Christopher de Hamel. A HISTORY OF ILLUMINATED MANUSCRIPTS. (Phaidon, 1986).

My own work is with thirteenth-century English manuscripts and clerical education, so 
mine is rather earlier than and geographically separated from your work.  I can provide 
some references to manuscripts which may help you, if only by association. There are, to 
answer your question about specific books with clerics, images of clerics in some of the 
English apocalypse mss.  There is nothing quite so obvious as the cleric instructing the 
owner, but the general relationship of cleric to text seems to bear out the idea.  These 
are (the mss, I mean): Cambridge, Trinity College MS R. 16.2; Oxford, Bodleian Library 
MS Douce 180; Lisbon, Gulbenkian Museum MS L.A. 139; London, British Library, MS Add. 
42555; London, Lambeth Palace Library, MS 209; Oxford, New College MS 65.
I spent some time browsing through English books of hours, to see what examples I could 
readily find and haven't specific correlations to assist you. I only treat the books 
owned by clerics to the level of archbishop, so I hope others will be able to give much 
more specific help.
Marian Hollinger ([log in to unmask])