Crossword Genius

I shall not be in good health (3)

Ross

I believe the answer is:

ill

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'i shall' is the definition.
(contraction of 'I will')

I can't explain the remainder of the clue.

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(Other definitions for ill that I've seen before include "Badly diminished" , "Not in good health" , "poor" , "Sickly" , "trouble" .)

I've seen this clue in The Irish News.
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