Crossword Genius

Printing mistake, rare, unsettled corporation (7)

Ross

I believe the answer is:

erratum

'printing mistake' is the definition.
(an erratum is a typographical error)

'rare unsettled corporation' is the wordplay.
'unsettled' is an anagram indicator.
'corporation' becomes 'tum' (I've seen this before).
'rare' anagrammed gives 'erra'.
'erra'+'tum'='ERRATUM'

(Other definitions for erratum that I've seen before include "fluff on paper" , "something wrong?" , "Faux pas" , "Mistake in book, etc" , "Typo" .)

I've seen this clue in The Times.
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