Crossword Genius

Turbid sea mud contains electric jellyfish (7)

Ross

I believe the answer is:

medusae

I'm a little stuck... Click here to teach me more about this clue!

'turbid sea mud contains electric' is the definition.
I can't judge whether this defines the answer.

'jellyfish' is the wordplay.
I cannot quite understand how this works, but
'jellyfish' could be 'medusa' (synonyms) and 'medusa' is found within the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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