Crossword Genius

Scoundrel blocking intelligence agency's bugs (7)

Ross

I believe the answer is:

cicadas

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'bugs' is the definition.
(insects)

I can't explain the remainder of the clue.

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(Other definitions for cicadas that I've seen before include "Noisy insects" , "These insects have an acid sac" .)

I've seen this clue in The Guardian.
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