Crossword puzzle clue "hint of something imminent"

Hint of something imminent

Something your poetry teacher might assign you to write about a particularly inspirational poetry teacher you've had *hint* *hint

Hint (and a hint to this puzzle's theme)

"Mrs. Frisby and the Rats of ___" (classic 1971 children's book based on experiments at the National Insistute of Mental Health, hint hint)

Headed for ___ (in imminent trouble)

Imminent, old-style

Imminent, or how six of this puzzle's entries turn

Imminent