Unwell still, though losing stone (3)

I believe the answer is:

ill

I'm a little stuck... Click here to teach me more about this clue!

'unwell' is the definition.
(similar in meaning)

'still though losing stone' is the wordplay.
'ILL' is hidden within the letters.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for ill that I've seen before include "Not in the pink" , "state of America" , "weak" , "US state" , "Valetudinarian" .)

I've seen this clue in The Times.

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