Sentence:  If Hufnagel's looking for a hint, he might want to get his defence to focus on <WSD>slotback</WSD> P.K. Sam. Even though the Argos say they want to run the ball more, passing will remain the key part of the equation. 
Meaning of the word marked with <WSD> tags:  A particular position in Canadian football, similar to a hybrid between wide receiver and running back. This position is more common in the Canadian game than its American counterpart.