Crossword Genius

Marlin's milieu (3)

Ross

I believe the answer is:

sea

'marlin's milieu' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sea that I've seen before include "The Aegean, for example" , "Caspian, e.g." , "7 [ship] s on this" , "Ocean area" , "Division of an ocean" .)

I've seen this clue in the Penny Press, the Family Time and the Universal.
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