Crossword puzzle clue "contents of three squares in this puzzle per an old comedy routine"

Contents of three squares in this puzzle, per an old comedy routine

The squares of "three squares"

Daily crosswords, to puzzle pros (so-called from the number of squares per side)

Like the contents of this puzzle's circled squares, in a nursery rhyme

Inadequate effort ... or the contents of six squares in this puzzle?

Topic of a classic 1940s comedy routine, and the inspiration of this puzzle

Psalm 100 excerpt suggested by six puzzle answers and graphically represented by certain black squares in this puzzle

Poet whose classic work is hidden in this puzzle (see the circled squares of the completed the puzzle)