Inform of new books provided over year (6)
I believe the answer is:
notify
'inform' is the definition.
(I know that notify is a more specific form of the action inform)
'new books provided over year' is the wordplay.
'new' becomes 'n' (abbreviation as in New Testament NT).
'books' becomes 'OT' (abbreviation for Old Testament).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'year' becomes 'y'.
'n'+'ot'+'if'+'y'='NOTIFY'
'of' acts as a link.
(Other definitions for notify that I've seen before include "Send word" , "Formally tell" , "Make known" , "Officially inform" , "alert" .)