Answer:

deadair

Answer	Crossword Clue
DEADAIR	Unintended radio broadcast silence
DEADAIR	Disc jockey's nightmare
DEADAIR	Radio silence

DEADAIR	Broadcaster's cardinal sin
DEADAIR	Broadcast snafu
DEADAIR	Unintended radio silence
DEADAIR	Silence during a radio broadcast
DEADAIR	Broadcasting no-no
DEADAIR	Broadcasting worry
DEADAIR	Moment of silence?
DEADAIR	Awkward radio silence