Here are the possible solutions for diagonal moving piece clue
Answer
Clue
Relevancy
bishop
Clue
Diagonal-moving piece
Diagonal-moving chesspiece
Definition
a senior clergyman in charge of a diocese
abe
Clue
Nickname of the man (born 2/12/1809) who gave the address at 18A, issued the 28A/45A, was the first elected president of the 60A Party, and whose name can be found in this puzzle's main diagonal
area
Clue
In a rhombus, half the product of its diagonal lengths