Anaesthetics in a book of the bible? (7)
I believe the answer is:
numbers
I believe this clue is a double definition.
'anaesthetics' is the first definition.
(things that make things numb)
'book of the bible?' is the second definition.
(book of the Old Testament)
'in a' is the link.
(Other definitions for numbers that I've seen before include "Old Testament book -- narcotics?" , "Ciphers" , "Quantities; Old Testament book" , "Figures, digits" , "Amounts; songs, etc" .)