Crossword Genius

Cartel due to change when covered with sores? (9)

Ross

I believe the answer is:

ulcerated

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

'covered with sores?' is the definition.
I can't tell whether this defines the answer.

'cartel due to change' is the wordplay.
'to change' indicates an anagram.
'cartel'+'due'='carteldue'
'carteldue' is an anagram of 'ULCERATED'.

'when' is the link.

Can you help me to learn more?

(Another definition for ulcerated that I've seen is " Cankerous".)

I've seen this clue in the Sydney Morning Herald.
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