Crossword puzzle clue "the four longest answers in this puzzle end in them"

The four longest answers in this puzzle end in them

Org. that has four teams with non-plural nicknames, which begin this puzzle's four longest answers

Each of the four longest puzzle answers has two pairs of them

Chop-chop (or... the last name responsible for the four one-word songs at the end of this puzzle's longest answers)

How many letters are in the longest answers in this puzzle - or how many of these answers there are

Word that's "shifted" in the first four letters of the four longest answers

Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers

What words concealed by the other four longest Across answers do ... and also, what each of them is