Answer:

plug

Answer	Crossword Clue
PLUG	Electrical connector
PLUG	Drain filler
PLUG	Stopper

PLUG	Cork
PLUG	Hype
PLUG	Promote
PLUG	Advertise
PLUG	Endorse
PLUG	Impromptu ad
PLUG	Ad-libbed ad
PLUG	Blatant promotion

PLUG	Shameless promotion
PLUG	Stop up
PLUG	Good word
PLUG	Favorable word
PLUG	Socket insert
PLUG	Outlet connection
PLUG	Advertisement
PLUG	Talk show guest's blatant promotion

PLUG	Fire finisher?
PLUG	Put in a good word for
PLUG	Word after spark or shameless
PLUG	Outlet insert
PLUG	Publicize insistently
PLUG	Transplanted hair
PLUG	Worn-out horse
PLUG	Part of an electrical appliance

PLUG	Spark or fire follower
PLUG	Commercial endorsement
PLUG	Outlet insertion
PLUG	Free advertisement
PLUG	Over-the-hill horse
PLUG	Stop
PLUG	Ballyhoo
PLUG	Commercial pitch

PLUG	Pronged connector
PLUG	Spark add-on
PLUG	Sink stopper
PLUG	Promote, in a way
PLUG	Auto tune-up insert