Related Clues:

• Boggy expanse
• Encumber, with 'down'
• Peat pit
• Low land
• Peatland habitat
• Stick in the mud?
• Overwhelm, as with work
• Duck habitat
• Sticky mud
• Overwhelm with work
• A different synonym of it is hidden in 25-, 32-, 41- and 46-Across
• Boggy ground
• Waterlogged lowland
• Inundate
• Where one may wallow