50a. Series of sombre conclusions tourist in Wales might come to 6. 47d Back boiler exploding 6. ?i???o 51d. Trainee roughly dealt with little boy fleeing. 5. ??d?t
51d looks as if it should be cadet. Perhaps 'ca' = about could be the roughly bit, and the name Ted retreating. Not the brightest of clues, though, if that's it.