Variety Cryptic Crossword: Mismatches 

Crossword: Mismatches by Hex
I solve a variety cryptic crossword with help from the live chat on Twitch.
Instructions:
EACH of the nine "Mismatches" clues consists of
definitions only for two randomly paired words.
With a little help, these words can be matched
up with their proper partners for entry in the
grid. Solvers will need to add a single letter
to each of the defined clue answers and then
find the pairs of newly formed words that
intersect on the added letters. When all nine
pairings have been correctly placed in the
diagram, their crossing letters may be read from
left to right, column by column, to show what
unites them. "Mismatches" clue answers include
one proper noun. All other entries, which are
clued normally, include three capitalized words.