Crossword puzzle clue "quarterback known for his active knee"

Quarterback known for his active knee

Responded to one on his knee, to his delight

Like an active quarterback, at times

Retired quarterback whose brother Eli still plays quarterback for the Giants: 2 wds.

Psychology pioneer known for his work in classical conditioning (and for his dogs): 2 wds.

5 : - ) , emoticon known for active hips

Quarterback during what's known in football as "The Drive"

Quarterback known as "The Snake"