Crossword Genius

Bug 17a held by US spooks (6)

Ross

I believe the answer is:

cicada

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

I can't explain the remainder of the clue.

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(Other definitions for cicada that I've seen before include "Noisy winged insect" , "The insect produces a high-pitched sound" , "one that loves the heat" , "Chirpy little thing" , "Stridulating insect" .)

I've seen this clue in The Telegraph.
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