Crossword Genius

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

Ross

I believe the answer is:

ailing

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

I don't understand the remainder of the clue.

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(Other definitions for ailing that I've seen before include "Infertile" , "Ill" , "Sickly, poorly" , "not doing very well" , "Troubled in mind or body" .)

I've seen this clue in the Evening Standard.
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