Transport of internal combustion (3)

I believe the answer is:

bus

'transport' is the definition.
(busing is a kind of transporting)

'of internal combustion' is the wordplay.
'of' indicates the answer is hidden within the clue.
'BUS' can be found hidden inside 'internal combustion'.

(Other definitions for bus that I've seen before include "Charabanc" , "Of projectiles; (go) mad (slang)" , "Something caught" , "Mode of public transport" , "Large passenger vehicle - small business!" .)

I've seen this clue in The Globe and Mail.

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