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Thanks for all the help, everyone! You guys are good at these.

Here is a couple more I have.

1 Expect rapid inflation in this following a heavy crash. (6)

2 One not at home in their current surroundings. (3,7)

3 Hey, numismatologist! Explain yourself! (1,7,5)

4 Cockatoo, probably. (3,5,4)

1, Airbag ?

Have you no letters for any of these?