Second person in Bible tied with S&M? (8)
I believe the answer is:
thousand
'sm?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'second person in bible tied' is the wordplay.
'second person in bible' becomes 'thou' (second person pronoun as in 'thou shalt not kill').
'tied' becomes 'sand' (I am not sure about this - if you are sure you should believe this answer much more).
'thou'+'sand'='THOUSAND'
'with' is the link.
(Other definitions for thousand that I've seen before include "Numeric value of kilo" , "in MCC, but missing double century" , "Large number" , "-- Island dressing" , "Grand" .)