Opposition Leaders

The meta answer is INVERT (Hint: Look for a 6-letter verb). The name of the puzzle was "Opposition Leaders." The 6 longest Across answers are 2-word phrases, the first of which all are opposites of other words. Rather, the "leaders" of those 6 answers are words with other words in "opposition" to them:

19A. [SUPERIOR]COURT > INFERIOR

27A. [DAY]CAMP > NIGHT

33A. [APPEAR]IN > VANISH

40A. [WEST]SIDE > EAST

45A. [LEFT]JAB > RIGHT

54A. [BOTTOM]FEEDERS > TOP

Those first words--SUPERIOR, DAY, APPEAR, WEST, LEFT and, BOTTOM--are the opposites of INFERIOR, NIGHT, VANISH, EAST, RIGHT, AND TOP.

Now what? The first letters of those words (again, "leaders") spell the word INVERT, a word alluding making something opposite, and a 6-letter verb that satisfies the puzzle's hint.

Good one! I initially had DISAPPEAR as the opposite of APPEAR. But INDERT didn't mean anything!

Nice! Tried INFRA/SUPRA before realizing VANISH worked and had symmetry of course.

I had IN_ERT and couldn't figure what the opposite to APPEAR might be, so I guessed that INVERT made more sense than INSERT or any other possibilities.

Another fun puzzle with a neat mechanism. I imagine this would be MUCH harder for those new to metas who have not learned to question EVERY title, especially one that has some "position" in it. I first tried to append ANTI or PRO to every word, but a 6 letter answer with 6 long two-word grid entries was just too much of a "hey, look over here!!!" I stalled a little trying to get a S word for APPEAR (can't be SEE, that is not opposite, can't be D, though IN DERT is where I often am, and then it hit me, if something is the opposite of appearing it is vanishing and INVERT is the perfect answer. Well done my friend, well done.