Fine country, not good as marsh (7)

'marsh' is the definition.
(I know that marsh can be written as fenland)

'fine country not good' is the wordplay.
I cannot really understand how this works, but
'fine' could be 'f' (abbreviation) and 'f' is present in the answer.
'country' could be 'land' (synonyms) and 'land' is located in the answer.
The remaining letters 'en' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'as' is the link.