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In poor health - result of a car accident? (3,4)

Ross

I believe the answer is:

run down

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'in poor health' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for run down that I've seen before include "Tired - shabby - criticise" , "brief review" , "slate" , "not very well" , "pan?" .)

I've seen this clue in The Globe and Mail.
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