Related Clues:
- River with plague at the bottom
- Of the greatest depth
- Most friendly
- Flower parasite most difficult to fathom
- River bug, most insidious
- Troublesome creature under river most hard to get at there?
- Furthest down
- River trial is most demanding
- Problem beneath the river, at the very bottom
- Exercise in river and street is hardest to understand
- Most learned to loathe record for the first time
- Girl, a nuisance, being most hard to fathom
- Most friendly with Whitehead, the new master
- Most profound river bore
- Taking longest for the plumber to get to