Answer:

scope

Answer	Crossword Clue
SCOPE	It will have you seeing things
SCOPE	Range
SCOPE	Extent

SCOPE	Sniper's aid
SCOPE	Listerine competitor
SCOPE	Breadth
SCOPE	Brand of mouthwash
SCOPE	Listerine alternative
SCOPE	Rifle attachment
SCOPE	Elbowroom
SCOPE	Sweep

SCOPE	Ambit
SCOPE	Length and width
SCOPE	Aim improver
SCOPE	Check (out)
SCOPE	Halitosis fighter
SCOPE	Purview