Crossword Genius

It's good to give fish to the ill (6)

Ross

I believe the answer is:

ailing

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

I cannot understand how the remainder of the clue works.

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(Other definitions for ailing that I've seen before include "Sickly, poorly" , "Infertile" , "Ill" , "In poor health" , "not doing very well" .)

I've seen this clue in the Evening Standard.
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