Possible Clues:

• Comes into sight
• Finish off the crustaceans right away
• Behead one like this and that's what 19 across will make one
• Block passage of
• Put an end to
• "___ Bill" (2003)
• 'A View to a ___' (Bond film)
• Take life seriously
• Where to put it out of its misery if it's sick at last
• See 25