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Completed grid apart from one letter.
21d. Made a mess of Artex lacking finish. (4) ?AME
There is a misprint in the definition. The correct letter is O.
I'm guessing it is DAME. anagram of MADE. But can't get any more out of it.
Thank you.

I haven't done this one yet, but could it be that the misprint is mOde, and the answer is RATE, anagram of Arte(x)?

finn is correct

Yes, I had just realised my mistake and came on here to correct it.
Thank you finn, and sonofRover.