Related Clues:

• Swampy ground
• Wet ground
• Peat place
• Encumber, with 'down'
• Peat pit
• Overwhelm, as with work
• Overwhelm with work
• A different synonym of it is hidden in 25-, 32-, 41- and 46-Across
• Boggy ground
• Inundate
• Cranberry terrain
• Cranberry patch
• Wet spongy land
• Slow the progress of, with "down"
• Sphagnum source