Here are the possible solutions for extras may comprise one clue
Answer
Clue
Relevancy
mob
Clue
Extras may comprise one
Definition
to crowd about
act
Clue
Several scenes might comprise one, on Broadway
Definition
to do something in a specified way
airplaneseating
Clue
Windows commonly comprise about one-third of it
alcoa
Clue
One of the 30 companies that comprise the Dow Jones Industrial Average
dag
Clue
Former UN leader Hammarskjöld [Note: The circled letters comprise a three-word instruction that, when applied to one square in the completed grid, reveals a group who might follow a code of silence]
Definition
to remove clotted tufts of wool from a sheep
are
Clue
Comprise
Definition
a unit of metric land measure
blank
Clue
Like the squares that comprise this puzzle's special letters
Definition
empty
catwalk
Clue
Fashion runway, or, in a way, what this puzzle's 10 perimeter answers comprise