Hello solvers! Thanks for giving this puzzle a shot. I'm not a good judge, but I think this may prove tricky. Hope you found it enjoyable? Let me know how you got on in the comments. And like and subscribe for more, obvs.
Here's the wash-up:
ACROSS. 1A. Reversal of "exceptions" = BUTS. The surface reading is meant to be Linux-related.4A. Double definition.7A. Subtract half of "Homer" = PIGEON.8A. "Penny" = P + subtraction of "one" = I from "once more" = AGAIN.9A. Subtraction of "Trumpist slogan" = MAGA from "Arsenal" = MAGAZINE.
DOWN. 1D. "Bob" = S + "cut" = LOP. Apologies for this bit of pre-decimal coinage trivia.2D. TO given literally + "fire" = ZAP reversed ("up").3D. "ask" = BEG + initial letters from "ask not".5D. Hidden ("sported by") in "wWIGenerals".6D. "Pen" = RUN (as in e.g. "chicken run") + first letter of "Edda".