(The seemingly inevitable answer in a crossword like this that just defies a coherent clue) Here goes: How an umlaut is typed when the two dots aren’t available (2) followed by short for a back muscle (3) followed by a verb whose present tense plural is “are” (2)
8A
Proportionately
9A
What a popular science curriculum turns into when adding arts and theater (inits)
Down
1D
What many baseball coaches tell kids before swinging at a pitch
2D
Android snobs who wouldn’t be caught dead owning an Apple device?
3D
NHL’s Blues visiting the Senators on a scoreboard (with the last letter malfunctioning—hey, it happens)
4D
Animal that grew a spine: Ver_______
5D
Larger than a throw rug, but used to clean your shoes?