Resolute man allowed to start with Bible books (7)
I believe the answer is:
adamant
'resolute' is the definition.
(both can mean determined)
'man allowed to start with bible books' is the wordplay.
'to start' suggests taking the first letters.
'with' says to put letters next to each other.
'bible' becomes 'ada' (I am not sure about this - if you are sure you should believe this answer much more).
'books' becomes 'NT' (New Testament).
The first letters of 'man allowed' is 'ma'.
'ma' put after 'ada' is 'adama'.
'adama'+'nt'='ADAMANT'
Can you help me to learn more?
(Other definitions for adamant that I've seen before include "Inexorable" , "Obdurate and unyielding" , "popstar" , "Impervious to pleas or persuasion" , "6a [PRINCESS IDA] 's fortress < for unyielding" .)