Answer:

jammed

Answer	Crossword Clue
JAMMED	Improvised, in a way
JAMMED	Filled to capacity
JAMMED	Pressed tightly together

JAMMED	Played with an impromptu gathering of musicians
JAMMED	Played without arrangements
JAMMED	Chock-full
JAMMED	Interfered with, in radio.
JAMMED	Fouled up.
JAMMED	Like rush-hour buses
JAMMED	Stuck, as a coin
JAMMED	Blocked, as radio broadcasts

JAMMED	Obstructed
JAMMED	Improvised on guitar
JAMMED	Clogged