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All aboard on convertible, crossing motorway: it might move very slowly! (8,4)

Ross

I believe the answer is:

abnormal load

'it might move very slowly' is the definition.
(vehicle carrying a large weight)

'all aboard on convertible crossing motorway' is the wordplay.
'convertible' indicates anagramming the letters.
'crossing' is an insertion indicator.
'motorway' becomes 'm'.
'all'+'aboard'+'on'='allaboardon'
'allaboardon' anagrammed gives 'abnoralload'.
'abnoralload' placed around 'm' is 'ABNORMAL LOAD'.

I've seen this clue in The Times.
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