Struggling with NW and SE corners:
13a "Losing head, alien foe turned on a wolf" (5);
A???A
2d "Infernal lake sci-fi writer nearly placed in Australia" (7); A???N?S
36d "Sort of boat having gone to the bottom, PC to finish official report" (6,5);
C?M??? R?N?U
46d "Publishes fanatics, concealing name" (6);
?T?E?S
Any help appreciated