Some rather contrived clues in this one - eg the use of odd abbreviations - for example LR for letter in 33a.
I wonder if there is also a cluing error here. 31a clearly is SPORTED and defines 21d which is otherwise unclued. But the obvious answer to 25d , which is not undefined, (Cold, breaking off search) is SHEAR,and not SCOUR, but this would give an E instead of O in 31a. I wonder if there is also an errror in the rubric, in that 1d, 21d and 42d are clued by 11a only and not by 11 and 18.