Crossword puzzle clue "what this puzzle's four longest answers have in common"

Houses with sharply angled roofs, and what this puzzle's four longest answers literally have in common

Off one's rocker, and a hint to what the four longest puzzle answers have in common

What this puzzle's four longest answers have in common

Features of some sports cars, and what this puzzle's four longest answers have in common

Wee hr., and a hint to a feature common to this puzzle's four longest answers

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

What this puzzle's seven longest answers have in common

Number of protons by which the elements in the four longest puzzle answers have been enhanced