Israeli intelligence uncovered bones (4)

I believe the answer is:

ossa

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'bones' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for ossa that I've seen before include "Technical name for bones" , "Hard things" , "famous mount" , "So as to become a Greek mountain" , "So as to turn to bones" .)

I've seen this clue in The Sunday Times and The Times.

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