Crossword Genius

I will repeat: 'That's ignorant!' (10)

Ross

I believe the answer is:

illiterate

'ignorant' is the definition.
('illiterate' can be a synonym of 'ignorant')

'i will repeat' is the wordplay.
'i will' becomes 'ill' (I've seen this before).
'repeat' becomes 'iterate' ('iterate' can be a synonym of 'repeat').
'ill'+'iterate'='ILLITERATE'

'that's' is the link.

(Other definitions for illiterate that I've seen before include "Analphabetic" , "dunce" , "twenty seven?" , "lacking in education" , "Ignorant" .)

I've seen this clue in The Telegraph.
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