Crossword Genius

Mistakes awfully rare? Thank you! (6)

Ross

I believe the answer is:

errata

'mistakes' is the definition.
(erratum is a kind of mistake)

'awfully rare? thank you' is the wordplay.
'awfully' indicates an anagram.
'thank you' becomes 'ta'.
'rare' is an anagram of 'erra'.
'erra'+'ta'='ERRATA'

(Other definitions for errata that I've seen before include "List of printed mistakes" , "Noted mistakes" , "Slips" , "corrected mistakes" , "List of text corrections to be made in a publication" .)

I've seen this clue in The Telegraph.
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