Nice, logical grid. Unfortunately, COOL and SETTLE could be swapped between their two groups. There's only supposed to be one valid way for the puzzle to be solved, so it can be done by knowledge band logic, rather than just lucky guessing. 'SETTLE' needs to be changed for something that can't go with 'DOWN', or 'COOL' needs to be changed for something that doesn't mean 'CALM', to avoid having two directly interchangeable answers and therefore two equally valid solutions.

Thanks Dgms,
I hadn’t noticed that, and so have now edited the grid to fix this!

Thanks Dgms,
I hadn’t noticed that, and so have now edited the grid to fix this!