Obliged to get blue exterior on Aussie car (8)

I believe the answer is:

beholden

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'obliged to' is the definition.
(thesaurus)

'blue exterior on aussie car' is the wordplay.
'exterior' suggests removing the centre.
'on aussie car' becomes 'holden' (I can't explain this - if you can you should believe this answer much more).
'blue' with its middle taken out is 'be'.
'be'+'holden'='BEHOLDEN'

'get' is the link.

Can you help me to learn more?

(Other definitions for beholden that I've seen before include "Under an obligation" , "Obliged" , "Owing thanks, indebted" , "Owing gratitude (to)" , "Bound" .)

I've seen this clue in the Sydney Morning Herald.

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