Each of the answers to the feeder puzzles is a different length and fits neatly into one of the columns at the top of the grid.
This is a variation of a dropquote puzzle. Each of the letters in the boxes can be dropped into the an empty spot in the column below to spell out a message. Key to solving this is noting that the words do not end at the edges of the grid, and only where there is an extra bold line. Also helpful is noticing the the word PUZZLE starting in the third column, which ultimately becomes part of the ten-letter word METAPUZZLE. The completed dropquote appears below:
As the completed grid indicates, the solution to this metapuzzle is DROP THE MIC.