Good decoration on stamp books (8)
I believe the answer is:
obedient
'good' is the definition.
('obedient' is associated in meaning with 'good')
'decoration on stamp books' is the wordplay.
'decoration' becomes 'obe'.
'on' says to put letters next to each other.
'stamp' becomes 'die' (I've seen this in other clues).
'books' becomes 'nt' (New Testament).
'obe'+'die'+'nt'='OBEDIENT'
(Other definitions for obedient that I've seen before include "Complying with commands" , "Ready to submit to authority" , "Like monk" , "Complying with orders" , "Amenable" .)