Crossword puzzle clue "rows of people waiting"

One who rows, rows, rows the boat

Rows of people waiting

Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize

Rows of rows

Butts ahead of people waiting - or gives up waiting?

One of the ones waiting in "Waiting for Godot"

Response to waiting too long for someone who's waiting?

"Waiting ... still waiting ..."