Last two. 4 down See perfectly in grey-green light (4)
G?O? Thought it could be GLOW, LO in GW, but couldn't see why.
18 down Reduced ships: after cutting one hundred, notice emperor upset (6) ?A?E?S Kind of worked out C AD E SS, but this doesn't seem to exist.
Thanks.
see+ras all reversed - but don't have the crossword to know if there are instructions to be followed because the rest of the clue doesn't make sense for that answer
just the last 3 words, not most of the clue which is why i put the question marks for it and wondered if there were instructions as to how the clue/answer might need transforming