Possible Clues:

• Draws a blank
• Leaves behind, perhaps
• Unable to remember
• It escapes one that that's where Smith is: a backstreet
• Where Smith is, the backward saint is out of his mind
• Never mind what one does with this
• One never minds the blacksmith working there at the backstreet
• One does not remember to have one's horse shod there at the backstreet
• One never minds that there is a smithy on a backstreet
• Leaves back at the house, maybe