Likable prayers introducing a set of holy books (8)
I believe the answer is:
pleasant
'likable' is the definition.
(thesaurus)
'prayers introducing a set of holy books' is the wordplay.
'prayers' becomes 'pleas' (plea is a kind of prayer).
'introducing' says to put letters next to each other (some letters go before others).
'set of holy books' becomes 'NT' (abbreviation for New Testament).
'pleas'+'a'+'nt'='PLEASANT'
(Other definitions for pleasant that I've seen before include "Attractive" , "Lovely" , "Refreshing" , "Enjoyable, nice" , "A greeable, affable" .)