Crossword Genius

Root cause of a vehicle getting rust on (6)

Ross

I believe the answer is:

carrot

I'm a little stuck... Click here to teach me more about this clue!

'root cause' is the definition.
'carrot' can be an answer for 'root' (I've seen this before). I am not sure about the 'cause' bit.

'a vehicle getting rust on' is the wordplay.
'a vehicle' becomes 'car' (car is a kind of vehicle).
'getting' means one lot of letters go next to another.
'rust on' becomes 'rot' (I am not sure about the 'on' bit.).
'car'+'rot'='CARROT'

'of' is the link.

Can you help me to learn more?

(Other definitions for carrot that I've seen before include "Enticement; vegetable" , "Tapering vegetable" , "orangey colour" , "Obstacle in race" , "Root vegetable" .)

I've seen this clue in the Evening Standard.
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