Theme: A Wordplay-Related Quip. What makes this type of puzzle difficult – at least, for me — is that since there are no clues, you have to fill in the surrounding answers to figure out the quip. This quip is split on the grid in 4 parts:
20A. Part 1 of a wordplay-related quip = Is it
21A. Quip, part 2 = just me or
35A. Quip, part 3 = are there other
52A. Quip, part 4 = anagrams
55A. End of quip = of em.
So, a play on words: Is it just me or are there other anagrams of em? Cute!
A few other interesting answers:
15A. Figure on a Utah license plate. Answer: Arch.
56A. Bag lady? Answer: Kate Spade.
60A. Site of one of the world’s most famous onion domes. Answer: Agra. Atop the Taj Mahal.
9D. Radiohead frontman Yorke. Answer: Thom.
21D. _____ Löw, coach of Germany’s 2014 World-cup winning team. Answer: Joachim
45D. Wordsmith who wrote “Last but not least, avoid clichés like the plague.” Answer: Safire (William)