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I am thoroughly stuck on 4 clues:

13D, radiation from heated objects, 8 letters: ?N???R?E
4D, make a quick rotation and go back, 4,2,4,4: TURN??O?E?H?E?
18A, core for winding an electrical core, 6 letters: ???M??
43A, corrode (something), 6 letters: EAT?N?O

infrared
turn on ones heel
former
eat into

Thank you so much!!!