Wrong road for biblical mount (5)
I believe the answer is:
sinai
'biblical mount' is the definition.
(I've seen this in another clue)
'wrong road' is the wordplay.
'wrong' becomes 'sin' (wrong can mean a sin or crime).
'road' becomes 'AI' (resembles A1, a major UK road).
'sin'+'ai'='SINAI'
'for' acts as a link.
(Other definitions for sinai that I've seen before include "Mount where Moses received God's law" , "place to receive instructions about behaviour" , "Mt. where Moses received 10 Commandments" , "Egyptian desert" , "Peninsula, mostly desert, at north end of Red Sea" .)