Completed everything but unsure about 10D:
For some, a braced framework extended luck (5)
It's either TRESS or TREST (dial. terms for 'trestle'), but can't make sense of the rest of the word play.
Also, I know what the answer to 7D is, because there are no unchecked cells, but I can't explain the word play:
Gemini as seen earlier, in the morning before (5)
CORAM.
I understand the 2nd half (incl. the def. 'before'), but don't see why 'Gemini as seen earlier' = COR.