Here are the possible solutions for apt word to substitute for each of four black squares to make sense of the across answers on either side of them clue
Answer
Clue
Relevancy
bridge
Clue
Apt word to substitute for each of four black squares to make sense of the across answers on either side of them
Definition
to connect across a gap
hideinplainsight
Clue
What words concealed by the other four longest Across answers do ... and also, what each of them is
lbars
Clue
Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers
latifah
Clue
Queen whose name contains three apt words in a row, as does each of this puzzle's four longest answers
detergent
Clue
What each of the four longest Across answers ends with
Definition
a cleansing agent
oath
Clue
Secret pledge in each of the four longest Across answers
Definition
a formal declaration or promise to fulfill a pledge
goodpoint
Clue
"Your argument makes sense," and a feature of the ends of four Across answers
even
Clue
Like each answer in this puzzle - also each word in each clue - in length
