Definitions of clasp:

• noun:   the act of grasping

  Example: "He released his clasp on my arm"

• noun:   a fastener (as a buckle or hook) that is used to hold two things together
• verb:   hold firmly and tightly
• verb:   grasp firmly

  Example: "The child clasped my hands"

• verb:   fasten with a buckle or buckles
• verb:   fasten with or as if with a brooch