| Underground creature | 20 |
| Underground conduits for water | 30 |
| Underground conduits | 20 |
| Underground conduit | 19 |
| Underground complexes | 21 |
| Underground commuter | 20 |
| Underground colonist | 20 |
| Underground coal source | 23 |
| Underground channel | 19 |
| Underground chambers | 20 |
| Underground chamber | 19 |
| Underground cemetery | 20 |
| Underground cartoonist's products | 37 |
| Underground car | 15 |
| Underground burrower | 20 |
| Underground burial site | 23 |
| Underground burial places | 25 |
| Underground bud | 15 |
| Underground branch | 18 |
| Underground blast, perh. | 24 |
| Underground band? | 17 |
| Underground band | 16 |
| Underground asset | 17 |
| Underground artists, maybe | 26 |
| Underground art site in Spain | 29 |
| Underground anchors | 19 |
| Underground activity | 20 |
| Underground | 11 |
| Undergraduate law deg. | 22 |
| Undergraduate degs. | 19 |
| Undergraduate degree, to a pilot | 32 |
| Undergrads: Abbr. | 17 |
| Undergrads' Greek leadership society | 40 |
| Undergrads' degrees | 23 |
| Undergrads | 10 |
| Undergrad. degrees | 18 |
| Undergrad. bigwigs | 18 |
| Undergrad, perhaps | 18 |
| Undergrad's digs | 20 |
| Undergrad's bugbear | 23 |
| Undergrad tech degs. | 20 |
| Undergrad pad | 13 |
| Undergrad MIT degrees | 21 |
| Undergrad housing | 17 |
| Undergrad degs. | 15 |
| Undergrad degrees: Abbr. | 24 |
| Undergrad degrees | 17 |
| Undergrad curriculum for a doctor-to-be | 39 |
| Undergrad course, briefly | 25 |
| Undergrad course of study | 25 |
| Undergrad course | 16 |
| Undergrad | 9 |
| Undergone | 9 |
| Undergoing vertigo | 18 |
| Undergoing severe trials | 24 |
| Undergoes vertigo | 17 |
| Undergoes recession | 19 |
| Undergoes nivation | 18 |
| Undergoes liquefaction, as a gel | 32 |
| Undergoes ecdysis | 17 |
| Undergoes dentition | 19 |
| Undergoes again, as an experience | 33 |
| Undergoes a transformation | 26 |
| Undergoes a recession | 21 |
| Undergoes a chemical change | 27 |
| Undergoes | 9 |
| Undergo, old style | 18 |
| Undergo without yielding | 24 |
| Undergo transformation, as one image into another | 49 |
| Undergo training, perhaps | 25 |
| Undergo recession | 17 |
| Undergo odontiasis | 18 |
| Undergo natural selection | 25 |
| Undergo mitosis | 15 |
| Undergo induction | 17 |
| Undergo gradual change | 22 |
| Undergo erosion | 15 |
| Undergo ecdysis | 15 |
| Undergo diffusion | 17 |
| Undergo decomposition | 21 |
| Undergo decay | 13 |
| Undergo chemical change | 23 |
| Undergo change | 14 |
| Undergo basic change | 20 |
| Undergo anew | 12 |
| Undergo an uncomfortable phase of infancy | 41 |
| Undergo alteration | 18 |
| Undergo again | 13 |
| Undergo a merger | 16 |
| Undergo a chemical transformation | 33 |
| Undergo a chemical change | 25 |
| Undergo a change of habit? | 26 |
| Undergo a change | 16 |
| Undergo | 7 |
| Undergarments that show a little of the chest | 45 |
| Undergarments that allow for air flow? | 38 |
| Undergarments | 13 |
| Undergarment, for short | 23 |
| Undergarment with an underwire | 30 |
| Undergarment that makes scaly legs look good? | 45 |