Value of sacred book for fussy functionary (9)
I believe the answer is:
jobsworth
'fussy functionary' is the definition.
(both can mean an officious worker)
'value of sacred book' is the wordplay.
I cannot really understand how this works, but
'value' could be 'worth' (I've seen this before) and 'worth' is found within the answer.
'of' could be 'o' and 'o' is located in the answer.
'book' could be 'b' and 'b' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
(Other definitions for jobsworth that I've seen before include "Petty rules upholder" , "A stickler for rules" , "Petty bureaucrat" , "Official who upholds petty rules" .)