Possible Clues:

• Substitute, supersede
• Put back where you found it
• Put back (in position)
• Salesperson with material to substitute
• Provide a substitute for two materials
• Succeed maybe as one selling on net
• Put something back where it belongs
• Salesman has to add secret ingredient to succeed
• Substitute rough material with finer one
• Return made by salesman on a shoestring