Answer:

linebacker

Answer	Crossword Clue
LINEBACKER	Gridiron position
LINEBACKER	Part of a football defense
LINEBACKER	All-pro Jack Ham is one

LINEBACKER	Customer service agent?
LINEBACKER	Red-dogger, e.g.
LINEBACKER	Defensive stalwart
LINEBACKER	Defensive stalwart, in football
LINEBACKER	Ray Lewis, for one
LINEBACKER	Blitz participant
LINEBACKER	Player who might tackle a wide receiver