Spars in the ring, and features of the four longest puzzle answers

Question:

Answer:

BOXES

Length:

Similar Crossword Questions:

Item with features that begin this puzzle's four longest answers
Important trial figure, or what you'll be when you read this puzzle's other four longest answers
Word hidden in this puzzle's longest answers
Number of protons by which the elements in the four longest puzzle answers have been enhanced
Summer blazer, which can come before the starts of this puzzle's four longest answers
Commerce minder found in eight of this puzzle's longest answers
Elite Navy group that's fittingly camouflaged in the four longest answers in this puzzle
Right now, as hidden in this puzzle's longest answers
It can follow the last word of this puzzle's five longest answers
"Figure head" found in this puzzle's longest answers
Shades of it begin this puzzle's four longest answers
They're hidden in this puzzle's seven longest answers
Ones in charge of a case ... or a literal hint to the eight other longest answers in this puzzle
Deg. of the professional who may instruct you to do the last words of the four longest puzzle answers
Discussion group, and a word that can follow the ends of this puzzle's five longest answers
Boat lifters found in this puzzle's three longest answers
Bird hiding in the four longest puzzle answers
HBO's "Inside the __" (and hidden theme in this puzzle's four longest answers)
Annual cause of losing an hr.'s sleep hidden in this puzzle's 10 longest answers
Number of times the letter 'U' appears in each of this puzzle's eight longest answers
Sequence found in this puzzle's five longest answers
You can find one in the four longest puzzle answers, even if you don't believe
Popular version of a design principle acronym spelled out by the starts of this puzzle's four longest answers
Last letter in most plurals (but not in this puzzle's six longest answers, which are the only plurals in this grid)
They're hidden in this puzzle's six longest answers