On stage, Bible not at first readable (7)
I believe the answer is:
legible
'readable' is the definition.
('legible' can be similar in meaning to 'readable')
'on stage bible not at first' is the wordplay.
'on' says to put letters next to each other.
'stage' becomes 'leg' ('leg' can be a synonym of 'stage').
'not at first' means to remove the first letter.
'bible' with its initial letter taken off is 'ible'.
'leg'+'ible' is 'LEGIBLE'.
(Other definitions for legible that I've seen before include "Capable to be read" , "Unlike a doctor's handwriting?" , "Good characters are" , "Able to be read" , "Possible to read" .)