Crossword Genius

Disparage when weakened by illness (7)

Ross

I believe the answer is:

rundown

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'disparage' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for rundown that I've seen before include "brief analysis" , "Disparage" , "Find fault" , "ski slope" , "Decry" .)

I've seen this clue in The Irish Independent.
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