Outsize vehicle prized by the stars (5)

I believe the answer is:

oscar

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'prized by the stars' is the definition.
I can't judge whether this definition defines the answer.

'outsize vehicle' is the wordplay.
'outsize' becomes 'os'.
'vehicle' becomes 'car' (car is a kind of vehicle).
'os'+'car'='OSCAR'

Can you help me to learn more?

(Other definitions for oscar that I've seen before include "feature of award ceremony" , "Mr Wilde - film award" , "Phonetic code for O" , "US film award" , "- - Peterson, pianist" .)

I've seen this clue in The Irish Independent.

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