Crossword Genius

Trailing about somewhat to find bones (4)

Ross

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'bones' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand how the remainder of the clue works.

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(Other definitions for isle that I've seen before include "Skye or Capri?" , "The Lake ... of Innisfree (W.B.Yeats)" , "Of Man or Youth, for example" , "Small area of land in water" , "small piece of land" .)

I've seen this clue in The Telegraph.
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