It has been an up-and-down season so far for the Seahawks’ defense, but one defender who has been consistently up is DE Chris Clemons, who quietly has emerged as one of the NFC’s most productive pass rushers with 7½ sacks. When the Seahawks obtained Clemons in a trade with the Eagles in exchange for Darryl Tapp, they had an inkling he could fill the “Leo” role in Pete Carroll’s defense which calls for a quicker, smaller pass rusher off the edge who could consistently get to the quarterback. “But they didn’t know how good he would also be against the run,” one daily team observer said of the 6-3, 254-pound Clemons, the leading tackler among Seattle’s defensive linemen. “He has real good leverage and uses his quickness to be consistently disruptive. They’re very happy with him.” Adding to that happiness is the fact that Clemons has been the team’s only starting D-lineman to avoid injury.