They all have just 1 clash, hankir (2d is entered BIKAR) and the trick is to make sure you get the right misprint each time. When you've done it you'll see strings of letters in each row that are themic (the first one starts with the B in row 1 - you'll quickly get the idea).
I found it easier to do them as I went along, having got most of the acrosses on the first pass - the top right corner went in quite easily (it must be tricky with all of the clashes entered as double cells!).
If you have another clean grid, maybe try it my way?
If your acrosses and downs match, then that cell letter is confirmed - if they clash, one of those letters is entered correctly for the down, say - but incorrectly for the across. Any letter in an unchecked cell is confirmed.
Now you know that 2d is entered BIKAR, you know that 14ac must be entered LKIRS (so that it has just the one misprint) and so on. But you must be sure each time you confirm a letter, no guesses (or you'll get into a mess)!