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Underwater boats with bed and emergency room for member (10)

Ross

I believe the answer is:

subscriber

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

'member' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'underwater boats with bed and emergency room' is the wordplay.
'underwater boats' becomes 'subs' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'bed' becomes 'crib' (bed for a child).
'and' means one lot of letters go next to another.
'emergency room' becomes 'ER' (abbreviation popularized by US TV series).
'subs'+'crib'+'er'='SUBSCRIBER'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for subscriber that I've seen before include "paid-up customer?" , "underwriter?" , "One showing approval of idea" , "One on the telephone" .)

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