I have a full grid but could someone help with the parsing for these please , then I may be able to read the messages given by the additional letters:
2d The French course least upset, as regards training
NURTURAL - la for the french, rut for the course, runT for least ???
8d Area upset after one's heading off? At no time (4) ...assume the answer is NEER?
16d NY building mostly awing new arrival that's entered (8)
FLATIRON .... could it be mostly (A)wing = flap
new = tiro ???