Crossword Genius

Hit by a vehicle – and not cared for (3,4)

Ross

I believe the answer is:

run down

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

'hit by a vehicle' is the definition.
(I've seen this before)

'not cared for' is the wordplay.
I cannot really see how this works, but
'not' could be 'un' (prefix meaning 'not') and 'un' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'and' is the link.

Can you help me to learn more?

(Other definitions for run down that I've seen before include "criticised?" , "In weakened health" , "Songbird" , "In a neglected state" , "pan?" .)

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