I pulled out 45D 8 or 9, but not 10: DIGIT because it reminded me of something that happened at the Magic Castle last week. A magician asked a volunteer to pick a number between 1 and 10, suggesting that the card she had selected would appear in the deck at the number chosen. The volunteer, flustered, picked 2, to the disappointment of the audience. After revealing her card in the second position, the magician asked her to pick a two-digit number. She picked 10 or 11. More groans from the audience. The poor volunteer started to say something that sounded a lot like, “I don’t many two-digit numbers,” which can’t possibly be true. Stagefright is a real thing.

Theme!

18A One remedy for a hangover, supposedly: PICKELJUICE.
23A Place to pick up a pepperoni pie, perhaps: PIZZAJOINT.
37A Close follower of the “horse race”: POLITICALJUNKIE.
48A Aircraft that’s 1% full?: PRIVATEJET.

57A Some Xmas card attire … or a hint to 18-, 23-, 37- and 48-Across: MATCHINGPJS.

Finished this one in 8:33 (mostly on my phone).