Smart cars, large? Use Minis when travelling round Ohio (10)

I believe the answer is:

limousines

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

'smart cars' is the definition.
'limousines' can be an answer for 'cars' (limousine is a kind of car). I am unsure of the 'smart' bit.

'large? use minis when travelling round ohio' is the wordplay.
'large?' becomes 'L' (eg in clothes sizes).
'when travelling' indicates an anagram.
'round' is an insertion indicator.
'ohio' becomes 'O' (abbreviation for Ohio).
'l'+'use'+'minis'='luseminis'
'luseminis' with letters rearranged gives 'limusines'.
'limusines' placed around 'o' is 'LIMOUSINES'.

Can you help me to learn more?

(Another definition for limousines that I've seen is " cars".)

I've seen this clue in The Independent.

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