Member of the electorate on a sea voyage? (13)

I believe the answer is:

floatingvoter

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'voyage?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'member of the electorate on a sea' is the wordplay.
'member of the electorate' becomes 'voter' (I've seen this in another clue).
'on' means one lot of letters go next to another.
'a sea' becomes 'floating' (I can't explain this - if you can you should give a lot more credence to this answer).
'voter' put after 'floating' is 'FLOATINGVOTER'.

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I've seen this clue in The Irish News.

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