Answer:

tripwire

Answer	Crossword Clue
TRIPWIRE	Trap trigger
TRIPWIRE	Trap triggerer
TRIPWIRE	Trigger on a trap

TRIPWIRE	Explosives detonator
TRIPWIRE	Booby trap feature
TRIPWIRE	Security alarm trigger

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.