Purpose-built conveyances, and a hint to 17-, 23-, 37- and 55-Across

Clue: Purpose-built conveyances, and a hint to 17-, 23-, 37- and 55-Across

We have 1 possible answer for the clue Purpose-built conveyances, and a hint to 17-, 23-, 37- and 55-Across which appears 1 time in our database.