Full grid and all but one of the redundant letters. I can see the wordplay in 4d but can’t fathom the extra letter (which would accompany “c”). Assistance gratefully received!
I've done it all except the second letter of 36a! Am i looking for a Period or climbers (unlikely)? So i fear an error. And yet the three letters re checked . I assume redundant letter is "i" Any help much appreciated!