About with Eric in dressing room by the sea? (6)

I believe the answer is:

cabana

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'about with eric in dressing' is the definition.
I can't tell whether this definition defines the answer.

'room by the sea?' is the wordplay.
'room' becomes 'cab' (cab is a kind of room).
'by the sea?' becomes 'ana' (I can't justify this - if you can you should believe this answer much more).
'cab'+'ana'='CABANA'

Can you help me to learn more?

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

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