Here are the possible solutions for grid group clue
Answer
Clue
Relevancy
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
montypython
Clue
Group who may see a holy grail in this grid
nfl
Clue
Grid group
abe
Clue
Puzzle theme which appears nine more times in the grid
acpt
Clue
Annual solving competition held in Brooklyn, briefly ... and a hint to nine squares in this grid
across
Clue
How the answer to this clue goes in the grid
Definition
from one side to the other
adozenroses
Clue
What you can find in the grid after completing this puzzle, looking up, down, left, right and diagonally, word search-style