Thoroughly soppy git by place of retreat (6)
I believe the answer is:
sodden
'thoroughly soppy' is the definition.
'sodden' can be an answer for 'soppy' (synonyms). I'm unsure of the 'thoroughly' bit.
'git by place of retreat' is the wordplay.
'git by' becomes 'sod' (I can't explain this - if you can you should believe this answer much more).
'place of retreat' becomes 'den' (I've seen this in another clue).
'sod'+'den'='SODDEN'
Can you help me to learn more?
(Other definitions for sodden that I've seen before include "heavy with moisture" , "Drenched through, really wet" , "Muddy" , "Made very wet" , "'Soaked, sopping (6)'" .)