9A Force instrument on Trump's powerless sidekick (8)
Last letter E.
12A White wine in extremity and a snack (7)
Last letter E
This will help open up the top right-hand corner. Thanks....
10A Corbyn's end in last catastrophic dip (5) S?A?T
I'm think SLANT (N+ anagram of last) but how does this = dip?...
pretty girl held by anarchist refused to submit to authority (8) -E-E---D