Crossword Genius

Missing, perhaps stolen, mostly (4)

Ross

I believe the answer is:

lost

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'missing' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lost that I've seen before include "Mislaid or strayed" , "TV show" , "Unable to find the way forward" , "Not recognising one's whereabouts" , "Mogul empire official; rich person" .)

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