She's where the boats are (6)

I believe the answer is:

marina

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'she's' is the definition.

'the boats are' is the wordplay.
'the boats' becomes 'marin' (I am not sure about this - if you are sure you should believe this answer much more).
'are' becomes 'a' (short for 'are', historical unit of measurement).
'marin'+'a'='MARINA'

'where' is the link.

Can you help me to learn more?

(Other definitions for marina that I've seen before include "Pleasure-boat dock" , "Berthing area for yachts" , "Harbour for pleasure yachts and small boats" , "Dock for yachts and cruisers" , "Airman (anag)" .)

I've seen this clue in the Evening Standard.

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