Another Angle

The answer to this puzzle is missing and I don't remember how to solve it. The last line in particular seems vague about which letter to take from each row.

• The highest grade
• A type of Hawaiian lava
• Animal or baseball equipment
• Inverse of cosecant
• The claw on the foot of a bird of prey
• The point furthest from the Earth on an orbit around it
• American (not British) name for a red insect with black spots
• Device for making sound from a CD
• One who makes or otherwise works with locks
• Something to add to liquid to stop it from freezing, as its name suggests
• An animal that eats grass
• Welcoming someone to their new house, or, used literally, turning on the heat inside

• First zone
• Jazz without German approval
• Endless park
• Overturned gas evaporates first
• Turned around, Japanese coin mantra
• Overturned car in, say, ageless hole?
• In sigh, first technique
• Two hundred and one in Yemen port city die from diet
• Before first road, California initially stole trains
• G8, say, keep Eritrea
• Six monster lizards containing smashed tin start mining
• United Nations and Germany train in red

Fill the above grid (to help you, the corners are already given). Take one letter from each row of the above grid, from top to bottom. This will give a 13-letter clue.