Member with holy book, not initially easy to read (7)
I believe the answer is:
legible
'easy to read' is the definition.
(I've seen this before)
'member with holy book not initially' is the wordplay.
'member' becomes 'leg' (member can mean a limb).
'with' is a charade indicator (letters next to each other).
'holy book' becomes 'bible' (I've seen this in another clue).
'not initially' means to remove the first letter.
'bible' with its first letter removed is 'ible'.
'leg'+'ible'='LEGIBLE'
(Other definitions for legible that I've seen before include "Easily read" , "Clear enough to read" , "Able to be read" , "Readable" , "Decipherable" .)