Bad treatment of poor Sue after being unwell (6)

I believe the answer is:

illuse

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'bad treatment' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'poor sue after being unwell' is the wordplay.
'poor' indicates anagramming the letters.
'after' is a charade indicator (letters next to each other).
'being unwell' becomes 'ill' ('ill' can be similar in meaning to 'unwell').
'sue' anagrammed gives 'use'.
'use' after 'ill' is 'ILLUSE'.

'of' acts as a link.

Can you help me to learn more?

(Another definition for illuse that I've seen is " Punishment".)

I've seen this clue in The Irish Independent.

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