| Clue | Length | Answer |
|---|---|---|
| undergirding | 4 letters | seat |
| undergirding | 4 letters | sill |
| undergirding | 5 letters | proof |
| undergirding | 7 letters | radical |
| undergirding | 7 letters | support |
| undergirding | 8 letters | rudiment |
| undergirding | 9 letters | principle |
| undergirding | 9 letters | tailpiece |
| undergirding | 10 letters | side-issue |
| undergirding | 10 letters | substratum |
| undergirding | 10 letters | supplement |
| undergirding | 11 letters | rock-bottom |
| undergirding | 11 letters | side-effect |
| undergirding | 11 letters | terra-firma |
| undergirding | 12 letters | ratification |
| undergirding | 12 letters | underpinning |
| undergirding | 12 letters | verification |
| undergirding | 12 letters | substructure |
| undergirding | 13 letters | reinforcement |
| undergirding | 13 letters | strengthening |
| undergirding | 14 letters | understructure |
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