Damp and low-lying (6)
I believe the answer is:
marshy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">damp and low-lying</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for marshy that I've seen before include "Long narrow mark" , "Wet and low-lying" , "(Of soil) soft and wet" , "treacherous underfoot" , "Boggy; waterlogged" .)