I DROPPED IN
Sarah Murphy

The answer to each clue below would be a common phrase - except that the letter I has been inserted into one of the words.

1. He's a master of all temper tantrums
2. Garlic would not work for this purpose
3. They're found at a numismatist's convention
4. GM car conks out in this spot
5. Airline captain gains some weight

Answers:

1. Jack of all tirades
2. Vampire bait
3. Pros and coins
4. The Buick stops here
5. The pilot thickens.