Lemongrass taken from valley around swamp (6)
I believe the answer is:
morass
'swamp' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for morass that I've seen before include "dangerous situation" , "Confusion" , "Tract of soft, wet ground" , "Bog or marsh" , "Bog or swamp" .)