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I am stuck on my last few in bottom left.

37D: Again went over unconventional scores penned by radical (9)
R?C?O?S
42D: American metric measure almost entirely in error (7)
L?T?R?? - Literal?, if so why?
51A: Government official's line adopted by support staff (5,3)
???c? / R?? - stick rod?

Recrossed?

51 black rod

Liter + al(l)

Literal (Chambers)

A misprint of a letter in a word (printing)

Thanks for quick reply Scorpiojo!