I have a full grid and the two unclueds.
I do not have the extra letter from 2d. I thought it was E from APE. But then the first word from extra letters does not make sense.
I am not sure what the uniquely identfiable letter is. May be in the same row as the first unclued answer?
I'd convinced myself there was a typo and the clue should read 'cop', not 'copy' (the APE part of the wordplay). 'cop'=[n]AP+EXES (former partners). I also needed some help for the right wordplay, hankir.
If you have the picture reference the brightest object is in the shape of a certain letter (and there's only one of them in the entire grid - and it's in exactly the right place).