A letter must be reinstated in each of 43 clues. The same letter that has been reinstated must replace one of the letters in the answer before entry. In clue order the original letters which have been replaced spell out what should replace two entries
Full grid with 2 entires replaced apart from one letter....
36d Upside-down, I kipped in something like strawberry patch (4) Grid answer is ?URF
curf/surf/turf/zurf ??
Original answer has a T removed