Illustration features, mainly, type of skin disease (6)

I believe the answer is:

psoric

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'illustration features mainly type of skin disease' is the definition.
I can't tell whether this defines the answer.

'illustration features mainly type' is the wordplay.
'illustration' becomes 'pic' (short for picture).
'features' is an insertion indicator.
'mainly' means to remove the last letter (virtually or mainly the word, but not all of it).
'type' becomes 'sort' (both can mean a kind or variety).
'sort' with its last letter taken off is 'sor'.
'pic' enclosing 'sor' is 'PSORIC'.

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I've seen this clue in The Independent.

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