Crossword puzzle clue "harder to crack"

"... ___ again, harder, harder!" (football cheer)

Alt.country singer Case whose "The Worse Things Get, The Harder I Fight, The Harder I Fight, The More I Love You" comes out tomorrow

Harder to crack

Crack or shot, but not crack shot

Harder to penetrate

No harder than

Kind of tray that's harder to find nowadays

"We try harder" company