Sentence:  Matt Stevens was crumpled by Euan Murray in another scrum, allowing Parks to kick for the corner, and when Richie Gray's clean take from the subsequent line-out set up a series of drives under the posts, Parks was back in the <WSD>pocket</WSD> to belt over a drop-goal to make it 9-3 at the interval. 
Meaning of the word marked with <WSD> tags:  The position held by a second defensive middle, where an advanced middle must retreat after making a touch on the attacking middle.