1) Big trouble 2) Heap of trouble 3) Highly contentious situation 4) Pack of trouble 5) Source of trouble 6) Trouble sign 7) Trouble, so to speak 8) Troublesome situation 9) Volatile situation Found on https://www.crosswordclues.com/clue/hornets-nest
1) Big trouble 2) Heap of trouble 3) Highly contentious situation 4) Pack of trouble 5) Source of trouble 6) Trouble sign 7) Trouble, so to speak 8) Troublesome situation 9) Volatile situation