Possible Clues:

• Acura model
• Former Acura model
• Bygone Acura
• Acura compact
• Old Acura model
• Bygone car model that's an anagram of GRANITE
• Bygone Acura that's involved in a crackup at 17-, 23-, 45- and 55-Across?
• Former Acura
• An Acura