Old Democrat organised procession for head of state? (9)

I believe the answer is:

motorcade

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'procession for head of state?' is the definition.
I can't judge whether this definition defines the answer.

'old democrat organised' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'organised' indicates anagramming the letters.
'o'+'democrat'='odemocrat'
'odemocrat' is an anagram of 'MOTORCADE'.

Can you help me to learn more?

(Other definitions for motorcade that I've seen before include "Car to demo (anag)" , "Procession of people in cars" , "vehicles in procession" , "Moving display" , "Vehicle procession" .)

I've seen this clue in The Times.

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