Crossword Genius

The vehicle a joker boarded? (5)

Ross

I believe the answer is:

wagon

I'm a little stuck... Click here to teach me more about this clue!

'the vehicle' is the definition.
(wagon is a kind of vehicle)

'a joker boarded?' is the wordplay.
'a joker' becomes 'wag' (I've seen this in another clue).
'boarded?' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'wag'+'on'='WAGON'

Can you help me to learn more?

(Other definitions for wagon that I've seen before include "Vehicle for transporting goods" , "Wild West trail vehicle?" , "Freight truck" , "Four-wheeled goods vehicle" , "On this, one keeps dry!" .)

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