| Travel requirement, at times |
| Where the 10 countries with the lowest median age are all located |
| Sounds of surprise |
| Book before Romans |
| "King James" |
| Word before nail or after steel |
| Cluster, as of grass |
| Product of volcanic activity |
| Certain grueling race, informally |
| Factory ___ |
| Moccasins, but not oxfords |
| Voice of doom |
| It's a me problem |
| End up OK |
| Boring bit |
| Not forbidden |
| "A Doll's House" playwright |
| Quattro preceder |
| "Joking!" |
| Secret traders |
| Father on "Modern Family" |
| Prof's helpers |
| Mary, Queen of ___ |
| Roman fountain name |
| Digital money |
| Van Gogh masterpiece |
| One dying for a cause |
| Leave a mark on? |
| Put up |
| Japanese exporter of diesel engines |
| Coastal inlet |
| "___ Fideles" |
| Letters that go in both blanks of ___ ___tofferson |
| Jug unit: Abbr. |
| Comfy shoe |
| Bank note made of pure cotton fiber |
| Bow-making timber |
| "Enthusiasm is the mother of ___": Ralph Waldo Emerson |
| One may ask for a dinner preference |
| Acid container, maybe |
| Hosp. area |
| Friar known for his patronage of animals |
| What had a major impact on this puzzle's theme? |
| Notwithstanding |
| Guinness records, typically |
| Some handoff recipients in football, for short |
| Some investments, in brief |
| Boston, Amherst and others |
| Immune response trigger |
| "Great" 10th-century emperor |
| Features of many ceratopsians |
| Something possibly triggered during a mass extinction event |
| Blue material |
| "___ favor" |
| Accelerated H.S. English course |
| First dog on an orbital spaceflight |
| Novelist King who wrote "Caretakers" and "One on One" |
| Applications |
| Some W.S.J. topics |
| Writer's reference … or what each row of shaded letters is missing? |
| It helps keep a tight ship tight |
| Beethoven's "Für ___" |
| Spooked by |
| Annual architecture award |
| Ancient method of encipherment with a message wrapped around a cylinder |
| Pants, but half off? |
| List follower |
| Newspaper supplement |
| Come together |
| Common typeface |
| Ruler's dimensions? |
| Crystalline mineral deposits in some caves |
| Like Beethoven, by his mid-40s |
| West Coast airport code |
| Music producer Gotti who worked with Ja Rule and J.Lo |
| Soak (up) |