Clapp was signed by the Detroit Lions' as an undrafted rookie free agent on April 30, 2010.[2] He was waived by the Lions on September 3, 2011.
Tampa Bay Buccaneers
Clapp was first signed by the Buccaneers on October 26, 2011. On December 11, 2011, he was suspended for the remainder if the 2011 NFL season and the first four games of the 2012 NFL season for unspecified reasons.[3]