Crossword Genius

Man being one is extremely lithe (4)

Ross

I believe the answer is:

isle

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'man' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for isle that I've seen before include "Small area of ground" , "one ringed in the main?" , "Land amid water" , "eg Hoy, Yell or Sark" , "Dogs, say" .)

I've seen this clue in The Telegraph and The Sun.
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