Puzzled to be on a boat, maybe (5)

I believe the answer is:

atsea

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'puzzled to be on a boat maybe' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'puzzled to be on a boat maybe' is the wordplay.
'puzzled' becomes 'a-sea' (I've seen this in another clue).
'to be on' indicates putting letters inside (as in clothing 'on' a person).
'a boat maybe' becomes 't' (I can't explain this - if you can you should give a lot more credence to this answer).
'asea' placed around 't' is 'ATSEA'.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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