Big car stripe trimmed by Grant? (9)

I believe the answer is:

chevrolet

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'big car' is the definition.
'Chevrolet' can be an answer for 'car' (car manufacturer). I am not sure about the 'big' bit.

'stripe trimmed by grant?' is the wordplay.
'stripe' becomes 'chevron' (synonyms).
'trimmed' means to remove the last letter (the last letter is trimmed off).
'by grant?' becomes 'let' (I've seen this in another clue. I am not sure about the 'by' bit.).
'chevron' with its final letter taken away is 'chevro'.
'chevro'+'let'='CHEVROLET'

Can you help me to learn more?

(Another definition for chevrolet that I've seen is " American car".)

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

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