Stuck on bottom left corner 39d Negative response politician's concealing that is, over time, bad publicity (9) N???R???? 52a Thoreau's disturbed second writer (9) ????O???S might get me kickstarted...
Stuck on the middle left hand side 34a Russian statesman's family after police operation heading to the west (8) P???M??? 18a It's essential to keep ice ready, after reading it back? (6) R?????
Last two I'm stumped on probably really obvious 1a PUshed last of animals out of the ark (4) S?L? and 27a Dancer set apart from odd characters in the area (4)?C?E
Stuck on two in top right corner 11d Wearing red, holding one in prayer (7) I?T???T and 18a Precise weight of gas? (5) O???E - is it ounce and if so why?