Crossword Genius

Illness inland may trouble when last operation cancelled (6)

Ross

I believe the answer is:

malady

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'illness' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for malady that I've seen before include "Sickness or disease" , "affection" , "Complaint" , "Illness or disease" , "Disease, ailment" .)

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