Crossword Genius

Tom sailed off, leaving maiden marooned (8)

Ross

I believe the answer is:

isolated

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'marooned' is the definition.
(I know that marooned can be written as isolated)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for isolated that I've seen before include "Set apart, quarantined" , "Cut off, remote" , "kept separate" , "Alone, set apart" , "hard to find" .)

I've seen this clue in The Telegraph.
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