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Mass above Pluto rising? Neptune, perhaps (3,3)

Ross

I believe the answer is:

sea-god

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

'neptune perhaps' is the definition.
(I know that Neptune is a sea god)

'mass above pluto rising?' is the wordplay.
I cannot really see how this works, but
'pluto' could be 'god' (Pluto was a Roman god) and 'god' is found in the answer.
The remaining letters 'sea' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for sea-god that I've seen is " Neptune or Poseidon".)

I've seen this clue in The Telegraph.
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