flee
竄 centers on escaping or hiding to avoid danger or capture: fleeing, running away, or concealing oneself.
竄 combines 穴 (hole, cave) with 鼠 (rat, mouse), suggesting a rat hiding in a hole or fleeing into a burrow. This is a well-established semantic compound.
A rat 鼠 darts into a hole 穴 to flee from danger. The kanji shows a rat disappearing into a cave, capturing the idea of escaping and hiding.
For ザン, imagine a rat fleeing into a hole while someone shouts 'Zan!' as it vanishes: Zan -> ザン, and the rat escapes into the cave.