Ambassador behind ceremonial transport (6)

I believe the answer is:

hearse

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'ceremonial transport' is the definition.
'hearse' can be an answer for 'transport' (hearse is a kind of transport). I am not sure about the 'ceremonial' bit.

'ambassador behind' is the wordplay.
'ambassador' becomes 'he' (His or Her Excellency).
'behind' becomes 'arse' (both can mean the buttocks).
'he'+'arse'='HEARSE'

Can you help me to learn more?

(Other definitions for hearse that I've seen before include "Funeral car" , "Car for carrying a coffin" , "Undertaker's vehicle" , "final vehicle?" , "Coffin conveyance" .)

I've seen this clue in The Telegraph.

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