| NGAURUHOE | Most active New Zealand volcano in the 20th century, erupting 45 times (9) |
| RUAPEHU | New Zealand volcano (7) |
| ONTHEBOIL | Active, new hotline box office initially installed |
| ACE | Thrilling golf feat achieved 45 times in the history of the U.S. Open |
| ALFREDNEWMAN | Composer who won nine Academy Awards and was nominated 45 times |
| ANTIFA | Active, new force of volunteers has provided a far-left movement (6) |
| ECONOMICS | Field of expertise shared by John Maynard Keynes and Milton Friedman in the 20th century (9) |
| TONYBLAIR | Former British Prime Minister who at 43 was the youngest to enter No 10 in the 20th century (4,5) |
| MOUNTETNA | Go up summits of Everest, Trivor, Nuptse and one of the most active volcanos in the world (5,4) |
| NIGHTHAWK | Person who likes to be most active during the hours of darkness (9) |
| MERCURIAL | Al! You are into crime - most active with it, too! (9) |
| GARYPLAYER | The only golfer in the 20th century to win the Open in three different decades |
| HEVER | Village in Kent, site of a 15th-century moated manor once home to a young Anne Boleyn that was restored in the 20th century for the 1st Viscount Astor (5) |
| METS | Major-league team with the most season losses, 120, in the 20th century |
| STROKE | 1958 Ellery Queen novel set during three different times in the 20th century (3,9,6) |
| THEFINISHING | 1958 Ellery Queen novel set during three different times in the 20th century (3,9,6) |
| PETERTHOMSON | The only golfer to win the Open for three consecutive years in the 20th century (5,7) |
| AKRON | ____, Ohio was the "Rubber Capital of the World" in the 20th century |
| GAYGORDONS | Which Scottish dance became popular in ballrooms around the globe in the 20th century? (3,7) |
| CLAVICHORD | Instrument developed from the medieval monochord that flourished from about 1400 to 1800 and was revived in the 20th century. Rectangular in shape, and its case and lid were usually highly decorated, |
