Grid 1 1d Use up (7) don't have any of the letters
3d trivial (5) don't have any of the letters
7a retail store (6) --r--- (market? first letter of this is also 2nd letter of 1d)
10a phantom (7) --l---e (first letter of this is 4th of 1d)
12a ridicule (4) --n- (first letter of this is 6th of 1d)