Go astray (3)
'go astray' is the definition.
(to err is to make an error or go the wrong way)
This is all the clue.
(Other definitions for err that I've seen before include "Sin" , "Slip up" , "Drop a clanger" , "'to... is human,to forgive divine'" , "Go wrong" .)
'go astray' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sin that I've seen before include "'Transgression, mortal or venial (3)'" , "Transgression of moral law" , "Lapse against moral law" , "Something wrong" , "Wrongdoing" .)