Possible Clues:

• Type of car at the start of 15 across
• Wham! "___ It Big"
• Auto title datum
• Rake in
• Urn
• Produce in a workshop
• Describes transport at the start of 15 across
• Employ too much effort providing instruction for six undefined clues here
• With 36- and 37-Across, get by, or how to find a second answer to each starred clue
• Keep the wolf from the door?