Spooner's marshland enemy, that shines faintly in mist (6)

'spooner's' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?

'marshland enemy that shines faintly in mist' is the wordplay.
I cannot quite see how this works, but
'mist' could be 'fog' (synonyms) and 'fog' is located in the answer.
The remaining letters 'bow' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?