Boggy (6)
I believe the answer is:
marshy
'boggy' is the definition.
(I know that boggy can be written as marshy)
This is the entire clue.
(Other definitions for marshy that I've seen before include "Boggy, swampy" , "Boggy; waterlogged" , "(Of soil) soft and wet" , "Soggy" , "Like swamps" .)