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 don't see how they can define each other.

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(Other definitions for flea that I've seen before include "one is proverbially fit" , "Blood-sucking parasites" , "Leaping insect" , "Biting type" , "Tiny circus performer?" .)

I've seen this clue in The Telegraph.
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